{"title":"Power Tubes (New Stock)","description":"\u003ctable class=\"collection-table\" border=\"0\" style=\"width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/tube-basics-and-frequently-asked-questions\" target=\"_blank\"\u003eTube Basics and FAQ\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/grading-matching\" target=\"_blank\"\u003eGrading and Matching\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/vacuum-tube-warranty-information\" target=\"_blank\"\u003eTube Warranty \u0026amp; Return Policy\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/cryogenically-treated-vacuum-tubes\" target=\"_blank\"\u003eCryogenic Treating\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/test-equipment\" target=\"_blank\"\u003eTube Testing Equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/why-we-dont-sell-certain-brands\" target=\"_blank\"\u003eWhy We Don't Sell Certain Brands\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","products":[{"product_id":"gold-lion-kt77-el34","title":"Gold Lion KT77 \/ EL34","description":"\u003ch1\u003e\u003cstrong\u003eGold Lion KT77\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eNotice: We supply the very finest KT77s, and our testing is the best, period. They are all burned in before testing and matching. These tubes are NOT as dependable as the Mullard EL34.  \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHowever, people really seem to like them....a lot. Our job is to tell you the facts. \u003c\/strong\u003e\u003c\/p\u003e\n\u003ch4\u003eOther dealers won't tell you the truth. Upscale Audio will.  \u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003eA modern re-creation of the legendary Genalex KT77. Produced in Russia.  Great mids, smooth, airy highs, incredible bass, wonderful 3D presence, and that natural glory you'd expect in an EL34. \u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eA quick note on this tube:\u003c\/strong\u003e\u003c\/em\u003e These tubes seem to take a bit longer to break in than some other power tubes, so if they sound a little lightweight in the bass, you have to give them time. Some guys are reporting at least 100 hours before the fully come into their own.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube. Includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micromhos, the next one at 8600 micromhos. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"No Cryo","offer_id":21828961413,"sku":"GOLD LION KT77","price":76.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21828961349,"sku":"GOLD LION KT77 C","price":84.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/99a0efb2e3065bde05217c1f37b764fa.jpg?v=1741632776"},{"product_id":"mullard-el34","title":"Mullard EL34","description":"\u003ch1\u003eMullard EL-34\u003c\/h1\u003e\nA modern re-creation of the classic Mullard. Produced in Russia by New Sensor. We've been playing these in everything from the \u003cstrong\u003ePrimaLuna amps\u003c\/strong\u003e to the Manley Classic 250s, and they sound great. Nice warmth, plenty of detail, but will retain a little more top end extension than the \u003cstrong\u003eSED Winged C.\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/xU4Df87DRFs\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micromhos, the next one at 8600 micromhos. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Mullard","offers":[{"title":"No Cryo","offer_id":21828962309,"sku":"MUL EL34","price":55.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21828962181,"sku":"MUL EL34 C","price":63.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/b8be5f0c3ef8564712440bcd29a9b740.jpg?v=1741632774"},{"product_id":"tung-sol-kt120","title":"Tung-Sol KT120","description":"\u003ch1\u003e\u003cstrong\u003eTung-Sol KT120 \u003c\/strong\u003e\u003c\/h1\u003e\nSuper cool KT88 variant made by New Sensor in Russia. This tube is a drop-in replacement for KT88s... no special re-wiring required! The KT120 is rated to have a plate dissipation of 60W... compared with the 35W of the 6550, the 42W of the KT88, that's a lot of juice!\n\u003cp\u003e\u003cstrong\u003eThe KT120 also draws more filament current from your amp's power transformer.\u003c\/strong\u003e Before you buy them, check with your amp's manufacturer to make sure you've got enough headroom. \u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eOne quick note:\u003c\/strong\u003e The KT120 is about 1\/2\" taller than a typical KT88, so if your KT88s are already a tight squeeze in your equipment, you may want to measure to make sure you have enough clearance before placing an order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/jhfpVs9gtaQ\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at, as an example, 6500 micro Ohms, the next one at 8600 micro \u003cspan\u003eOhms\u003c\/span\u003e. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":21828968965,"sku":"TUNGSOL-KT120","price":79.95,"currency_code":"USD","in_stock":false},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21828968901,"sku":"TUNGSOL-KT120-C","price":88.95,"currency_code":"USD","in_stock":false},{"title":"Audio Research Matched \/ No Cryo","offer_id":31952959045692,"sku":"TUNGSOL-KT120-ARC","price":97.95,"currency_code":"USD","in_stock":true},{"title":"Audio Research Matched \/ Yes Cryo","offer_id":31952959111228,"sku":"TUNGSOL-KT120-ARC-C","price":105.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/65f330021faf204616863c2448b73715.jpg?v=1741632772"},{"product_id":"electro-harmonix-kt88","title":"Electro-Harmonix KT88","description":"\u003ch1\u003e\n\u003cstrong\u003eElectro-Harmonix KT88\u003c\/strong\u003e \u003c\/h1\u003e\n\u003cp\u003eThere were a few versions of this tube created before what's available now. I waited for the first few batches to go through... experience has taught me that many times the first couple of batches suck as they begin to iron out the kinks. Sometimes, they NEVER get it right, and I don't want you to be the one we experiment with. Well... they got this one right... reliable and rugged, with great clarity and pop. \u003c\/p\u003e\n\u003cp\u003eFlat out a great tube.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 \u003cspan\u003emicro \u003c\/span\u003e\u003cspan\u003eOhms\u003c\/span\u003e, the next one at 8600 \u003cspan\u003emicro \u003c\/span\u003e\u003cspan\u003eOhms\u003c\/span\u003e. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Electro-Harmonix","offers":[{"title":"No Cryo","offer_id":21828969797,"sku":"EH KT88","price":69.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21828969733,"sku":"EH KT88 C","price":77.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/e667405ac1679155b047b40677f809da.jpg?v=1741632771"},{"product_id":"gold-lion-kt88","title":"Gold Lion KT88","description":"\u003ch1\u003eGold Lion KT-88\u003c\/h1\u003e\nRussian re-issue of the legendary Genalex KT88. These guys rock... They've been working great in all applications we've tried them in, and haven't had a single complaint. Read web forums and you'll see tons of praise for this tube. Sound is beautifully balanced... airy highs, gorgeous mids, deep dynamic bass. I know we shouldn't care about looks... but who am I kiddin'... with the side getters and Genalex-inspired silkscreening... they look bitchin' too!\u003cbr\u003e\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube.\u003c\/strong\u003e Includes matching in any quantity you need at no extra charge.\u003c\/p\u003e\n\u003cdiv align=\"center\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/ISZYEdajkrI\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micromhos, the next one at 8600 micromhos. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"No Cryo","offer_id":43030474162360,"sku":"GOLD LION KT88","price":99.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":43030474195128,"sku":"GOLD LION KT88 C","price":107.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/43b1c3c1c553d9e475b1c6e6e2a696c3.jpg?v=1741632769"},{"product_id":"gold-lion-kt66","title":"Gold Lion KT66","description":"\u003ch1\u003eGold Lion KT66\u003c\/h1\u003e\nRussian re-issue of the legendary Genalex. This one get's Uncle Kevvy's seal of approval. Built to the highest standards and is very reliable. Great substitite for the 6L6GC, but consult your amp's manufacturer: The KT66 has a higher dissippation than its 5881 and 6L6GC counterparts, and if your amp's bias range is set low you may not be able to bias these. Sound is lively and dynamic with a smooth natural midrange, with body and a holographic, 3D presence. All around a beautifully balanced sound.\n\u003cdiv align=\"center\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/HSTrBgzL-2g\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eA quick note on this tube:\u003c\/strong\u003e\u003c\/em\u003e Some folks report these KT66s take a bit longer to burn in than other power tubes. So if they seem a little light in the bottom end, just give it time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube. Includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"No Cryo","offer_id":21828983173,"sku":"GOLD LION KT66","price":77.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21828983109,"sku":"GOLD LION KT66 C","price":85.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/fe8daaaf50470a381697b0bfaf51bdfd.jpg?v=1741632768"},{"product_id":"sovtek-5881","title":"Sovtek 5881","description":"\u003ch1\u003eSovtek 5881\u003c\/h1\u003e\n\n\u003cp\u003eThe workhorse of the 5881 family. This is most commonly used 5881 on the market today. If you have a 5881-based amplifier, chances are this was the tube that came stock. It has solid, military-spec build quality, which makes it very sturdy and dependable. If you just want a tube that is just plain going to work and work and work and not cost big $$$, this is the tube for you. They sound pretty darn good too.\u003c\/p\u003e\n\u003cp\u003eThe 5881 can be used as a replacement for the 6L6GC, however it is a lower dissipation tube, which means less power, and you may need to back off the bias slightly depending on your amplifier. Consult your amp's owner's manual first. To be honest... if your amp can use the 6L6GC, I'd stick with that.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e","brand":"Sovtek","offers":[{"title":"No Cryo","offer_id":21828985861,"sku":"SOV 5881","price":39.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21828985797,"sku":"SOV 5881 C","price":47.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/31710c54f3326638c33ca53665ebb68e.jpg?v=1741632767"},{"product_id":"tung-sol-5881","title":"Tung-Sol 5881","description":"\u003ch1\u003e\n\u003cstrong\u003eTung-Sol 5881\u003c\/strong\u003e \u003c\/h1\u003e\n\u003cp\u003eNew production tube made by New Sensor in the Reflektor factory in Russia. Gotta 5881 amp and you're sick of using the same old Sovteks? Folks are really getting into this current production homage to the legendary Tung-Sol. Similar in looks to the original U.S. version, and folks \"in the know\" say they sound similar too.\u003c\/p\u003e\n\u003cp\u003eThe 5881 can be used as a replacement for the 6L6GC, however it is a lower dissipation tube, which means less power, and you may need to back off the bias slightly depending on your amplifier. Consult your amp's owner's manual first. To be honest... if your amp can use the 6L6GC, I'd stick with that.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"No Cryo","offer_id":21828986565,"sku":"TUNGSOL 5881","price":47.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21828986501,"sku":"TUNGSOL 5881 C","price":55.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/1d603a996e79042e50f7641725560d5d.jpg?v=1741632766"},{"product_id":"electro-harmonix-300b","title":"Electro-Harmonix 300B Gold Grid","description":"\u003ch1\u003e\u003cstrong\u003eElectro-Harmonix 300B \u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eThis is the default bitchin' tube that will not give you problems, sounds wonderful, and priced right. This is the most commonly used OEM tube for manufacturers of 300B amps because of it's low price and rugged build. There are many versions out there, this is the best \"gold grid\" version. Factory matched.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Electro-Harmonix","offers":[{"title":"No Cryo","offer_id":21829226693,"sku":"EH 300B","price":169.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21625681739836,"sku":"EH 300B CRYO","price":178.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/7b5b4de62098b2a003bf514e056577ec.jpg?v=1741632761"},{"product_id":"tung-sol-6l6gc-str","title":"Tung-Sol 6L6GC-STR","description":"\u003ch1\u003e\n\u003cstrong\u003eTung-Sol 6L6GC-STR\u003c\/strong\u003e \u003c\/h1\u003e\n\u003cp\u003eNew production tube made by New Sensor in the Reflektor factory in Russia. Perfect drop-in replacement for any 6L6GC amplifier. They're very well-built, and sound great with a little more midrange clarity than the SED, which has a little warmer character.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"No Cryo","offer_id":21830128581,"sku":"TUNGSOL6L6GC","price":48.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21830128517,"sku":"TUNGSOL6L6GC C","price":56.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/5b56c2f4a86fe820355a788895b4efcf.jpg?v=1741632687"},{"product_id":"tung-sol-kt-150","title":"Tung-Sol KT150","description":"\u003ch1\u003eTung-Sol KT150\u003c\/h1\u003e\n\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/9EzArd-P5Bg?rel=0\" frameborder=\"0\" allowfullscreen=\"\"\u003e\u003c\/iframe\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe overall sound of the KT150 is thunderously powerful. The bass is tight, full, and precise with a neutral midrange and transparent high end clarity. The dynamics are unlike anything we have ever heard before. This is truly the Tyrannosaurus Rex of beam tetrodes.\u003c\/p\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eWhat the manufacturer says:\u003c\/strong\u003e \"With the new KT150, Tung-Sol continues to lead in the audio power tube, power game. After the introduction of the highly successful Tung-Sol KT120, Russia's premier vacuum tube inventor, Valery Krivtsov, in collaboration with Irusha Bitukova and a team of ExpoPUL tube designers, set to work in our laboratories to develop an even more powerful audio output tube.\u003cbr\u003e\u003cbr\u003eWith a massive plate dissipation of 70 watts, the Tung-Sol KT150 is the most powerful octal beam tetrode ever produced. The Tung-Sol KT150 glass envelope is a special egg shaped balloon that was developed to improve thermal dissipation and maintain a superior vacuum for the best sound. The fact that the glass envelope has no flat sides means the Tung-Sol KT150 has no problems with microphonics.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003e\u003cem\u003eBecause each KT150 consumes 2.0A of filament current (more than the KT88 and 6550), we recommend contacting your equipment manufacturer to ensure your power supply is capable of powering this tube.\u003c\/em\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAdditionally, this tube is 5-1\/2\" from bottom of base (not including pins) to the top of the glass. Make sure your amp has at least 6-1\/2\" of clearance from top of the tube socket to the overhead limit. There must be room allowed for both tube installation and cooling. Also please understand that the plate structure of this tube is such that it almost completely obscures the heater element of the tube from view... so you will most likely not see these tubes glowing; this is normal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at, as an example, 6500 micro Ohms, the next one at 8600 micro \u003cspan\u003eOhms\u003c\/span\u003e. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eA nice note from our customer, Jeff Wheaton\u003c\/h2\u003e\n\u003cp\u003eGreetings, I am sure you are aware the KT150 drifts, when new, even after \"alleged\" matching by other sellers AKA ebay or other. Your burn-in solves this problem.\u003c\/p\u003e\n\u003cp\u003eProspective kt 150 buyers know this....many of the KT 150 Quads bought from small time operations cannot be used....they won't balance. I work at a custom tube amp builder. We now are ONLY buying your tubes or our customers MUST buy your KT 150'S or we won't set the AC\/DC balance for them. Several customers have brought unusable \"new KT 150\" quads to us which after 10 hours, drifted so far, they would not balance....now unusable......and they saved 15.00\/tube. Share this and save philes some money, and they will get longer tube life, and better sound.\u003c\/p\u003e\n\u003cp\u003eAudiophiles, believe Uncle Kevin...his tubes are better. The 150's match so nice now......Only get \"Real Matched tubes\".........Jeff\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"Platinum Grade \/ No Cryo","offer_id":640997130256,"sku":"TUNG-SOL KT150","price":139.95,"currency_code":"USD","in_stock":true},{"title":"Platinum Grade \/ Yes Cryo","offer_id":21830999493,"sku":"TUNG-SOL KT150 CRYO","price":147.95,"currency_code":"USD","in_stock":true},{"title":"Audio Research Matched \/ No Cryo","offer_id":31785176563772,"sku":"TUNG-SOL KT150 ARC","price":149.95,"currency_code":"USD","in_stock":true},{"title":"Audio Research Matched \/ Yes Cryo","offer_id":31785176531004,"sku":"TUNG-SOL KT150 ARC CRYO","price":157.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/9a9cec073f15580586e408277d8a4fa4.jpg?v=1741632501"},{"product_id":"electro-harmonix-kt90","title":"Electro-Harmonix KT90","description":"\u003ch1\u003e\n\u003cstrong\u003eElectro-Harmonix KT90\u003c\/strong\u003e \u003c\/h1\u003e\n\u003cp\u003eThe Electro Harmonix KT90-EH tube is a drop-in for any KT88 or 6550 tube... bias your amp just as you would a KT88 and you're good to go! Sonically they are true to the Electo Harmonix brand; clear top end that is open but not bright or tizzy, tight bottom end, and a clear midrange that is not hard or clinical. They are not a super warm tube.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micro Ohms, the next one at 8600 \u003cspan\u003emicro \u003c\/span\u003e\u003cspan\u003eOhms\u003c\/span\u003e. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Electro-Harmonix","offers":[{"title":"No Cryo","offer_id":21831300805,"sku":"EH KT90","price":88.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21831300741,"sku":"EH KT90 C","price":96.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/51da5d811b4f3c4b7dd7078737839537.jpg?v=1741632491"},{"product_id":"sovtek-6550we","title":"Sovtek 6550WE","description":"\u003cp\u003e\u003cstrong\u003eSovtek 6550WE\u003c\/strong\u003e - From Russia with love.  If you have an Audio Research amp, this is the tube you want.  These tubes are very rugged, reliable, and sound great.  They have a little bump in the midrange, tight bass, good top end extension. \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube.\u003c\/strong\u003e Includes matching in any quantity you need at no extra charge.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micromhos, the next one at 8600 micromhos. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Sovtek","offers":[{"title":"No Cryo","offer_id":21831479941,"sku":"SOV 6550WE","price":81.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21831479813,"sku":"SOV 6550WE C","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/90f3e5e6e0d4a485e08ddbcc78a981b9.jpg?v=1741632472"},{"product_id":"mullard-kt88","title":"Mullard KT88","description":"\u003ch1\u003e\u003cstrong\u003eMullard KT-88\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eBefore buying any power tubes you need to know this: Upscale Audio pays more for our tubes than other companies. We pay the factory to pre-test for us, and give us the top 50% of production. Upscale Audio tubes will last longer; period. Nobody pays attention to your tube purchase like Uncle Kevvy. Incredible tube! These sound very much like the Gold Lion KT88 to me. They come out of the same factory. Stunning mids, extended top end, and tight bass.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube.\u003c\/strong\u003e Includes matching in any quantity you need at no extra charge.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micromhos, the next one at 8600 micromhos. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Mullard","offers":[{"title":"No Cryo","offer_id":21831674885,"sku":"MULLARD KT88","price":74.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21831674693,"sku":"MULLARD KT88 C","price":82.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/88baff2edf530b614996b134da3ed869.jpg?v=1741632458"},{"product_id":"tung-sol-el34b","title":"Tung-Sol EL34B","description":"\u003ch1\u003eTung-Sol EL-34B\u003c\/h1\u003e\nProduced in Russia by New Sensor, in the Reflektor factory. They've been making some incredible tubes here lately, and this new re-issue is no exception. We've been playing these in everything from the \u003cstrong\u003ePrimaLuna amps\u003c\/strong\u003e to the Manley Classic 250s, and they sound great. Nice warmth, plenty of detail, great bass.\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e This applies especially to power tubes like EL34, 6550, KT88’s, etc. Two tubes can be brand new in the original box, with one testing at, as an example, 6500 \u003cspan\u003emicro Ohms\u003c\/span\u003e, the next one at 8600 micro Ohms. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Tung-Sol","offers":[{"title":"No Cryo","offer_id":21831678277,"sku":"TUNG-SOL EL34B","price":52.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21831678149,"sku":"TUNG-SOL EL34B CRYO","price":60.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/0c37a20156641178314721d20096a647.jpg?v=1741632457"},{"product_id":"mullard-6bq5-el84-new-production","title":"Mullard 6BQ5 \/ EL84 New Production","description":"\u003ch1\u003eMullard 6BQ5\/EL-84\u003c\/h1\u003e\n\nMade in Russia.  New production re-issue from New Sensor. Gorgeous mids, punchy bass, these guys are sure to please even the most demanding boutique EL84 amp owner.\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Mullard","offers":[{"title":"No Cryo","offer_id":21831681861,"sku":"MULLARD EL84","price":37.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":21831681797,"sku":"MULLARD EL84 C","price":45.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/eacbd59173645be1297247400655d7e2.jpg?v=1741632456"},{"product_id":"gold-lion-n709-el84-new-production","title":"Gold Lion N709 \/ EL84 New Production","description":"\u003ch1\u003eGenalex Gold Lion N709\/EL-84\u003c\/h1\u003e\nMade in Russia. New production re-issue from New Sensor. Gorgeous mids, punchy bass, these guys are sure to please even the most demanding boutique EL84 amp owner.\n\u003cp\u003eIf your amp is cathode bias, it will run these tubes too hard, causing them to fail prematurely! Use the early production Russia 6H14 instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePricing above includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"No Cryo","offer_id":25514307664,"sku":"GOLD LION EL84","price":49.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":29705621667900,"sku":"GOLD LION EL84 C","price":57.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/dd73ba7f2ba4e0cf16ccee7aebafccf7.jpg?v=1741632455"},{"product_id":"gold-lion-6v6gt-cv511","title":"Gold Lion 6V6GT \/ CV511","description":"\u003ch1\u003eGold Lion 6V6GT\u003c\/h1\u003e\nA modern re-creation of the legendary Genalex 6V6GT\/CV511. Produced in Russia by New Sensor. Feedback from customers say this tube embodies the quintessential \"6V6\" sound with amazing tone and reliability.\n\u003cp\u003e\u003cstrong\u003ePricing above is for a single tube. Includes matching in any quantity you need at no extra charge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/our-tube-testing-equipment\"\u003e\u003cstrong\u003eAll power tubes are Platinum Screened \u0026amp; Tested\u003c\/strong\u003e\u003c\/a\u003e to the highest standards, including a 72-hour burn in process, and testing at real-world voltages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEvery power tube is different.\u003c\/strong\u003e Two tubes can be brand new in the original box, with one testing at [as an example] 6500 micromhos, the next one at 8600 micromhos. Both tubes would be considered \"new\" by the factory, and not defective. While the weaker tube isn’t \"defective,\" it will certainly have a shorter life. So if you pay 10% less, you might get a tube with a significantly shorter life. The big lie from manufacturers of tube equipment and tube dealers themselves is that they “reject” these tubes. It’s not true. You can imagine the nightmare that would create for the tube factory if people are sending back 50% - 80% of the tubes that get shipped, coming back in all kinds of condition.\u003c\/p\u003e\n\u003cp\u003eAs the owner of Upscale Audio, a company that has supplied tubes into over 50,000 components, and someone obsessed with treating your amp like it’s my amp, I can tell you in no uncertain terms the factory doesn’t take them back. The only tubes they will take back are tubes that have shorts, gas, or measure BELOW the minimum number they assign for that tube type (it varies from type to type, so don’t bother trying to figure that out).\u003c\/p\u003e\n\u003cp\u003eI’ve overcome that issue for you. I can say with calm assurance that we pay the factories more for our tubes than any other tube seller, and we ensure that we receive the absolute cream of the crop. This flies against the logic of how to run a business: The way you make money is to pay less for the goods you sell! That’s what most ANY business owner will tell you. We also don’t sell certain brands of tubes because while they might be cheap and sometimes good, they can be more trouble than they're worth. We pass on a lot of money as a result.\u003c\/p\u003e\n\u003cp\u003eUpscale Audio is the only dealer that does what we do on a grand scale, and have a deep understanding of high end tube electronics. We’re the only dealer that manufacturers give a thumbs-up to, and recommend to their customers. And I promise you only the best.\u003c\/p\u003e\n\u003cp\u003e- Kevin Deal\u003c\/p\u003e","brand":"Gold Lion","offers":[{"title":"No Cryo","offer_id":31987637682236,"sku":"GOLD LION 6V6GT","price":57.95,"currency_code":"USD","in_stock":true},{"title":"Yes Cryo","offer_id":31987637715004,"sku":"GOLD LION 6V6GT C","price":65.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/gold-lion-6v6gt.jpg?v=1741631393"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/collections\/65f330021faf204616863c2448b73715.jpg?v=1653324969","url":"https:\/\/upscaleaudio.pro\/collections\/power-tubes-new-stock.oembed","provider":"Upscale Audio","version":"1.0","type":"link"}