{"title":"Balanced Audio Technology","description":"","products":[{"product_id":"balanced-audio-technology-rex-ii-power-amplifier","title":"Balanced Audio Technology REX II Power Amplifier (OPEN)","description":"\u003ch1\u003eBalanced Audio Technology REX II Power Amplifier\u003c\/h1\u003e\n\u003cp\u003eThe all-triode REX II power amplifier represents a technological tour de force of modern engineering applied to vacuum-tube power-amplifier design. From the plug-and-play simplicity provided by its auto-biasing and electronic protection circuits, to the palpable illusion of recreating the original musical event in your home, the REX II combines high-power output, beautiful midrange texture, and great extension at the frequency extremes. Delivering a robust 80 watts per channel in the stereo version or a compelling 160 watts per channel as a monoblock—and fully symmetrical from beginning to end—it is a design without compromise.\u003c\/p\u003e\n\u003cp\u003eTHE REX II Power amplifier represents a technological tour de force of modern engineering applied to vacuum tube power amplifier design. From the plug and play simplicity provided by its auto-biasing and electronic protection circuits, to the palpable illusion of recreating the original musical event in your home, the REX II Power amplifier is the ultimate expression of Balanced Audio Technology’s purist approach to creating a statement vacuum tube amplifier.\u003c\/p\u003e\n\u003ch3\u003eFully symmetrical all triode circuit\u003c\/h3\u003e\n\u003cp\u003eIn the world of vacuum-tube amplifier design, the vast majority of amplifiers are either of a push-pull or single-ended circuit topology. You’ll find the typical push-pull vacuum tube amplifier to be most commonly based upon a pentode tube – the 6550 or one of its variants being one popular choice. These push-pull amplifiers can provide high power output, but at the expense of ultimate transparency. The single-ended tube amplifier, on the other hand, often provides wonderful midrange transparency, but with the severe drawback of low power output and less than stellar reproduction of the frequency extremes.\u003c\/p\u003e\n\u003cp\u003eThe REX II Power amplifier is a different beast altogether. Its design is fully symmetrical from beginning to end. You can think of it as two single-ended amplifiers per channel, with their waveforms summed at the output transformer. The beauty of this design is that no direct current flows through the output transformer. Why is this critically important? This fact allows the output transformer to be a truly wide bandwidth design, while reducing low frequency distortion.\u003c\/p\u003e\n\u003cp\u003eWhen you combine this fully symmetrical circuit with a high-current, all-triode, zero-feedback, fully balanced design, the drawbacks of push-pull and single-ended designs are banished. The REX II Power amplifier combines high-power output, beautiful midrange texture, and great extension at the frequency extremes. It is a design without compromise.\u003c\/p\u003e\n\u003ch3\u003eVacuum-tube current sources\u003c\/h3\u003e\n\u003cp\u003eCompared to the previous generation of REX products, the REX II Power amplifier substantially improves its gain stage architecture by extending the benefits of vacuum-tube current sources to include both the first and second gain stages of the circuit design. The current source is an integral, albeit extremely important, part of a differential circuit. Its quality to a large degree determines the ultimate performance of a gain stage. As opposed to a more common resistive solution, the vacuum-tube current source is much closer to an ideal model. The benefits of implementing dual current-sources within the REX II Power amplifier are several-fold:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eThe linearity of the gain stage improves.\u003c\/li\u003e\n\u003cli\u003eThe adjustments for the first and second gain stages become independent and therefore more easily optimized.\u003c\/li\u003e\n\u003cli\u003eThe tube current source components operate at much lower stress level, thus improving reliability.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eIn addition, more than one type of vacuum tube can be used in the second-stage current-source. This allows each user to fine tune the Rex II Power amplifier’s sound to best meet their individual needs. No matter which choice the user selects, this dual current source implementation extends the performance of the REX II Power amplifier to another level. The final result is an impressive improvement in the palpability of the phantom musical event.\u003c\/p\u003e\n\u003ch3\u003e80 Watts per channel (Stereo) 160 Watts per channel (Mono)\u003c\/h3\u003e\n\u003cp\u003eThe REX II Power amplifier is a high-current all-triode design that offers a robust 80 watts per channel in the stereo version or a compelling 160 watts per channel as a mono block. The 6C33C-B triode output tube used in the REX II Power amplifier offers many times the current delivery of the more common 6550 tube used in more traditional push-pull designs. High impedance vacuum tubes like the 6550 require far more complicated output transformers than the low impedance 6C33C-B vacuum tube. Consequently, the REX II Power amplifier is quite comfortable driving low impedance loads. You can simply choose the stereo or monoblock version based upon your choice of speaker and room size. The high-current delivery of the REX II Power amplifier will give you the assurance of driving a difficult load with ease.\u003c\/p\u003e\n\u003ch3\u003eIntelligent auto-bias \u0026amp; electronic protection\u003c\/h3\u003e\n\u003cp\u003eThe advanced design of the REX II Power amplifier eliminates the traditional headache associated with most vacuum-tube power amplifiers; the constant need to set and readjust the proper bias of the output tubes. The REX II Power amplifier features an intelligent automatic bias circuit that adjusts for changing line voltage and aging tubes. For convenience, the intelligent automatic bias circuit contains LED indicators that show the status of each individual output tube. This auto-bias circuit also ensures that your REX II Power amplifier sounds wonderful within the first few minutes of listening. This is indeed very different from manually biased designs that must be adjusted for their thermally warm set point - and thus sound too cold and clinical before their tubes are fully warmed up.\u003c\/p\u003e\n\u003cp\u003eBalanced Audio Technology extends the plug and play nature of the REX II Power amplifier further with a novel “fuse-less” protection circuit. This electronic protection circuit eliminates the power supply rail fuses to provide both a more refined sonic performance, as well as a very user-friendly experience. All the user has to do in the event of an output tube being over-stressed is to flip the power switch; it doesn’t get any easier than that!\u003c\/p\u003e\n\u003cp\u003eNo tubes to bias. No tube fuses to replace. This is the best of modern engineering applied to vacuum-tube amplifier design.\u003c\/p\u003e\n\u003ch3\u003eIntelligent power upgrade\u003c\/h3\u003e\n\u003cp\u003eThe REX II Power amplifier is easily upgraded from the stereo version to monoblock configuration. Unlike competing designs, there is no need for the user to trade their amplifier in to obtain more power. With the REX II Power amplifier, the user can simply convert their existing REX II to a monoblock, and then order a second REX II monoblock to match. Technically, the stereo to monoblock conversion is accomplished by simply paralleling the inputs and outputs. This means that “the sound” only gets better as monoblock current delivery goes up by a factor of two and the monoblock noise floor drops appreciably as well.\u003c\/p\u003e\n\u003cp\u003eA little known fact is that you can even parallel the REX II monoblocks by daisy-chaining them together. Do you want 320 watts per channel of high current, zero feedback, fully balanced power? Just use two REX II monoblocks per side!\u003c\/p\u003e\n\u003ch3\u003eSummary\u003c\/h3\u003e\n\u003cp\u003eThe REX II Power amplifier from Balanced Audio Technology is the culmination of nearly two decades of research into what constitutes the ultimate vacuum-tube power amplifier. Right out of the box, it is unlike most vacuum tube power amplifiers in being a fully balanced symmetrical design. This balanced symmetry, when combined with a high current, zero-feedback, all triode, dual vacuum-tube current source topology makes the REX II Power amplifier special indeed. Add the plug and play nature of automatic biasing and automatic protection to the list, and you have a thoroughly modern vacuum-tube amplifier that, by design, performs well above the rest.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Per Channel (8 Ω \/ 4 Ω):\u003c\/strong\u003e 80 W \/ 80 W \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOutput in Mono Configuration (8 Ω \/ 4 Ω):\u003c\/strong\u003e 160 W \/ 160 W \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 5 Hz to 200 kHz\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTHD (Full Power):\u003c\/strong\u003e 3.0 % \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGain (Nominal into 8 Ω):\u003c\/strong\u003e 26 dB\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInput Impedance (Mono):\u003c\/strong\u003e 108 kΩ \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNumber of Power Cords:\u003c\/strong\u003e 1\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInput Impedance (Stereo):\u003c\/strong\u003e 215 kΩ \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Consumption (Idle \/ Full):\u003c\/strong\u003e 500 W \/ 1000 W\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube Complement:\u003c\/strong\u003e 4 x 6H30, 6 x 6SN7, 2 x 6V6, 4 x 6C33C-B \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e 17\" x 9\" x 24\"\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRemote Control:\u003c\/strong\u003e No \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 100 lb\u003c\/p\u003e","brand":"Balanced Audio Technology","offers":[{"title":"Default Title","offer_id":21832624389,"sku":"REXII-AMP OPEN","price":12995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/BAT_REX_II_Power_Amp_Silver_Front_2048x2048_cf28c537-d811-41ef-a782-1ec3e224ce6c.jpg?v=1741632414"},{"product_id":"balanced-audio-technology-rex-iii-monoblock-power-amplifiers-pair","title":"Balanced Audio Technology REX 3 Monoblock Power Amplifiers (pair)","description":"\u003ch1\u003eBalanced Audio Technology REX 3 Monoblock Power Amplifiers (pair)\u003c\/h1\u003e\n\u003ch3\u003eA 160 Wpc symmetrical single-ended bridge design with 6C33C triodes\u003c\/h3\u003e\n\u003cp\u003eBalanced Audio Technology engineer Victor Khomenko has put two-plus decades of research into creating the ultimate vacuum-tube power amp. The REX 3 all-triode power amplifier is the culmination of this work; a symmetrical single-ended bridge design using four of BAT’s signature triode 6C33C tubes with zero global feedback and an extremely short signal path that maintains a linear response in both frequency and phase domains.\u003c\/p\u003e\n\u003cp\u003eThis factory-configured monoblock pair offers 160 W per channel with each amp running in full triode mode. The custom-made output transformers are made to BAT’s exacting specifications, and have a wide-bandwidth frequency response from 5 Hz up to 300 kHz. The result is a presence and openness you can hear right from the opening note. \u003c\/p\u003e\n\u003cp\u003eAn intelligent automatic-bias circuit adjusts for changing line voltage and aging tubes, with LEDs showing the status of each tube. An ingenious fuse-less protection circuit eliminates power-supply rail fuses for better sonics and ease of use.\u003c\/p\u003e\n\u003cp\u003eThough a triode, the 6C33C-B output tube offers many times the current delivery of the 6550 tubes commonly employed in push-pull designs. Also, the high impedance of the 6550 tube requires far more complicated output transformers than the low-impedance 6C33C-B type. This allows BAT to spend money on sheer transformer tonnage and quality, and means the REX 3 is comfortable driving low-impedance loads.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Per Channel (8 Ω\/4 Ω):\u003c\/strong\u003e 160 W\/160 W\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eInput Impedance:\u003c\/strong\u003e 108 kΩ\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eGain (Nominal into 8 Ω):\u003c\/strong\u003e 26 dB\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTube Complement:\u003c\/strong\u003e 4 x 6H30, 6 x 6SN7, 2 x 6V6, 4 x 6C33C-B\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePower Consumption (Idle\/Full Power):\u003c\/strong\u003e 500 W\/1,000 W\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eDimensions: \u003c\/strong\u003e17\" x 9\" x 24\"\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 100 lb\u003c\/p\u003e","brand":"Balanced Audio Technology","offers":[{"title":"Black","offer_id":32504295653436,"sku":"REX3-MONO-PR BLK","price":50000.0,"currency_code":"USD","in_stock":false},{"title":"Silver","offer_id":32504295686204,"sku":"REX3-MONO-PR SIL","price":50000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/BAT_monopower_blk_1024x1024_0970f716-0c14-4ad1-b734-28610b8eb683.jpg?v=1741631216"},{"product_id":"balanced-audio-technology-vk-80i-integrated-amplifier","title":"Balanced Audio Technology VK-80i Integrated Amplifier","description":"\u003ch1\u003eBalanced Audio Technology VK-80i Integrated Amplifier\u003c\/h1\u003e\n\u003ch2\u003eFully balanced triode architecture, automatic bias, high-current 6C33C-B power tubes\u003c\/h2\u003e\n\u003cp\u003eThe graceful industrial design is based on BAT's flagship REX 3 system, and incorporates many of that series' technological advances.\u003cbr\u003e\u003cbr\u003eDelivering 55 W per channel, the 6C33-B triode output tube offers many times the current delivery of the 6550\/KT90 variants usually used in tube amps. This means you get the natural harmonic texture and instrumental timbre of triode design with no loss to bandwidth and dynamics, offering finesse, inner detail, and scale.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e“Fuse-less” protection circuit for enhanced sound and user-friendly operation\u003c\/strong\u003e\u003cbr\u003eIn the event an output tube becomes over-stressed, all you need to do is turn the VK-80i off and on again to restore normal operation. The elimination of internal channel and tube fuses contributes to a greater sense of ease and more natural reproduction of music. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIntelligent auto-bias design\u003c\/strong\u003e\u003cbr\u003eThe advanced engineering within the VK-80i eliminates the traditional headache associated with most vacuum-tube power amplifiers—specifically, the constant need to set and readjust the proper bias of the output tubes. The VK-80i features an intelligent automatic bias design that adjusts for changing line voltage and aging tubes, with each output tube having its own dedicated bias circuit. \u003c\/p\u003e\n\u003cp\u003eThe sum of this engineering excellence is an amplifier with the midrange clarity, power, and dynamics that have made BAT one of the most respected brands in high-end audio.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eAn all-metal remote control is included.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eOutput per channel at 8Ω\/4Ω:\u003c\/strong\u003e 55 W\u003cbr\u003e\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 8 Hz to 200 kHz\u003cbr\u003e\u003cstrong\u003eInput impedance:\u003c\/strong\u003e 215 kΩ\u003cbr\u003e\u003cstrong\u003eTube complement:\u003c\/strong\u003e 4 x 6SN7, 4 x 6C33C-B\u003cbr\u003e\u003cstrong\u003ePower consumption:\u003c\/strong\u003e 400W idle, 800W full power\u003cbr\u003e\u003cstrong\u003eInputs:\u003c\/strong\u003e 1 x XLR, 3 x RCA\u003cbr\u003e\u003cstrong\u003eVolume control:\u003c\/strong\u003e Resistive ladder, 90 steps, 1 dB per step\u003cbr\u003e\u003cstrong\u003eDimensions (WHD):\u003c\/strong\u003e 17\" x 8\" x 16\"\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 45 lb\u003c\/p\u003e","brand":"Balanced Audio Technology","offers":[{"title":"Black","offer_id":37596729704632,"sku":"BAT-V80I-BLK","price":9995.0,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":37596729737400,"sku":"BAT-V80I-SIL","price":9995.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/BAT_VK_80i_Integrated_Amplifier_Black_Front_2048x2048_e4e7a11b-aed2-4af5-90b0-135e904b5cef.jpg?v=1741631127"},{"product_id":"balanced-audio-technology-vk-90-tube-preamplifier","title":"Balanced Audio Technology VK-90 Tube Preamplifier","description":"\u003ch1\u003eBalanced Audio Technology VK-90 Tube Preamplifier\u003c\/h1\u003e\n\u003ch3\u003eSecond-generation transformer-coupled outputs provide exceptional purity\u003cbr data-mce-fragment=\"1\"\u003e\n\u003c\/h3\u003e\n\u003cp\u003eFeaturing transformer-coupled, high-current, single-gain stage topology, VK-90 is the finest single-chassis preamplifier ever created by Balanced Audio Technology. Wound with Cardas’ finest copper wire, the second-generation transformer-coupled outputs catapult the performance of this fully balanced, zero-feedback design to a reference level.\u003c\/p\u003e\n\u003cp\u003eEach transformer comes encapsulated within a mu-metal shield for the ultimate in signal purity and noise isolation. Electrically, these second-generation transformers improve VK-90’s ability to drive low-impedance loads. Sonically, they offer greater transparency than the already revered performance established by BAT’s first-generation transformer design.  \u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eFlexible User Interface\u003c\/h4\u003e\n\u003cp\u003eBoasting one of the most flexible user interfaces in the industry, VK-90 offers customizable options that range from dimming to fading and source-naming. It can also be fully upgraded to a REX 3 preamplifier. And you can always get the volume just right courtesy of a proprietary electronic shunt volume attenuator that offers 140 steps of 0.5 dB resolution. In the design, discrete metal film resistors bleed the unused signal to ground. From deep bass to extraordinary dynamics and layered transparency, VK-90 is your new reference. \u003c\/p\u003e\n\u003ch4\u003eEight 6H30 SuperTubes\u003cbr\u003e\n\u003c\/h4\u003e\n\u003cp\u003eMore than a decade ago, BAT introduced the world to the 6H30 SuperTube. VK-90 continues the tradition by using eight 6H30 SuperTubes to form an extraordinarily high-current, low-impedance drive engine. The signal is effectively transmitted through only one gain stage. The Unistage™ circuit provides the ultimate simplicity of amplifying the incoming signal only once, while using no global feedback to double back on the straight-through signal integrity.\u003c\/p\u003e\n\u003ch4\u003e\u003cspan\u003eSuperPak Power\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003eThe VK-90 preamplifier features Balanced Audio Technology’s all-new, third-generation SuperPak in its power supply. The design represents a significant rethinking of what is possible from an energy storage device. The SuperPak features hybrid construction with two capacitors built and potted into each individual low-resonance shell. An additional silver-in-oil capacitor—arguably the finest-quality capacitor offered at any price in the industry—is used as part of the Gen 3’s construction. The result: Low-level detail is revealed in a clear and unforced manner, while the overall sound takes on a beguiling sweetness and naturalness from top to bottom.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-mce-fragment=\"1\"\u003eThird generation SuperPak with 4x50 uF with internal silver\/oil hybrid construction\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-mce-fragment=\"1\"\u003eSilver gold oil bypass caps\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-mce-fragment=\"1\"\u003eUnistage design with only one gain block and no capacitors in signal path\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-mce-fragment=\"1\"\u003eOutput second generation output transformers with Cardas OFC wiring\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-mce-fragment=\"1\"\u003eZero global feedback\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eAbsolute polarity switchable\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-mce-fragment=\"1\"\u003eSpecifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eInputs:\u003c\/strong\u003e 5 x XLR\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eOutputs:\u003c\/strong\u003e 2 x XLR, 1 x XLR (Tape)\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eGain:\u003c\/strong\u003e 18 dB\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eVol Control Resolution:\u003c\/strong\u003e 140 x 0.5 dB steps\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTube Complement:\u003c\/strong\u003e 4 x 6H30, 2 x 6C19\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eInput Impedance (min):\u003c\/strong\u003e 100 kΩ\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eOutput Impedance:\u003c\/strong\u003e 200 Ω\u003cbr\u003e\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003ePower Consumption:\u003c\/strong\u003e 250 VA\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e19\" x 5.75\" x 15.5\"\u003cstrong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e40 lb\u003c\/p\u003e","brand":"Balanced Audio Technology","offers":[{"title":"Silver","offer_id":39688809021624,"sku":"VK-90-SIL","price":14995.0,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":39688808988856,"sku":"VK-90 BLK","price":14995.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/products\/BAT-VK-90-Black_2048x2048_25b3d947-ab38-447e-9d87-e8b7c27a5cb0.jpg?v=1741630958"},{"product_id":"balanced-audio-technology-rex-ii-monoblock-power-amplifiers-pair-open","title":"Balanced Audio Technology REX II Monoblock Power Amplifiers - Pair (OPEN)","description":"\u003ch1\u003eBalanced Audio Technology REX II Power Amplifier (OPEN)\u003c\/h1\u003e\n\u003cp\u003eThe all-triode REX II power amplifier represents a technological tour de force of modern engineering applied to vacuum-tube power-amplifier design. From the plug-and-play simplicity provided by its auto-biasing and electronic protection circuits, to the palpable illusion of recreating the original musical event in your home, the REX II combines high-power output, beautiful midrange texture, and great extension at the frequency extremes. Delivering a robust 80 watts per channel in the stereo version or a compelling 160 watts per channel as a monoblock—and fully symmetrical from beginning to end—it is a design without compromise.\u003c\/p\u003e\n\u003cp\u003eTHE REX II Power amplifier represents a technological tour de force of modern engineering applied to vacuum tube power amplifier design. From the plug and play simplicity provided by its auto-biasing and electronic protection circuits, to the palpable illusion of recreating the original musical event in your home, the REX II Power amplifier is the ultimate expression of Balanced Audio Technology’s purist approach to creating a statement vacuum tube amplifier.\u003c\/p\u003e\n\u003ch3\u003eFully symmetrical all triode circuit\u003c\/h3\u003e\n\u003cp\u003eIn the world of vacuum-tube amplifier design, the vast majority of amplifiers are either of a push-pull or single-ended circuit topology. You’ll find the typical push-pull vacuum tube amplifier to be most commonly based upon a pentode tube – the 6550 or one of its variants being one popular choice. These push-pull amplifiers can provide high power output, but at the expense of ultimate transparency. The single-ended tube amplifier, on the other hand, often provides wonderful midrange transparency, but with the severe drawback of low power output and less than stellar reproduction of the frequency extremes.\u003c\/p\u003e\n\u003cp\u003eThe REX II Power amplifier is a different beast altogether. Its design is fully symmetrical from beginning to end. You can think of it as two single-ended amplifiers per channel, with their waveforms summed at the output transformer. The beauty of this design is that no direct current flows through the output transformer. Why is this critically important? This fact allows the output transformer to be a truly wide bandwidth design, while reducing low frequency distortion.\u003c\/p\u003e\n\u003cp\u003eWhen you combine this fully symmetrical circuit with a high-current, all-triode, zero-feedback, fully balanced design, the drawbacks of push-pull and single-ended designs are banished. The REX II Power amplifier combines high-power output, beautiful midrange texture, and great extension at the frequency extremes. It is a design without compromise.\u003c\/p\u003e\n\u003ch3\u003eVacuum-tube current sources\u003c\/h3\u003e\n\u003cp\u003eCompared to the previous generation of REX products, the REX II Power amplifier substantially improves its gain stage architecture by extending the benefits of vacuum-tube current sources to include both the first and second gain stages of the circuit design. The current source is an integral, albeit extremely important, part of a differential circuit. Its quality to a large degree determines the ultimate performance of a gain stage. As opposed to a more common resistive solution, the vacuum-tube current source is much closer to an ideal model. The benefits of implementing dual current-sources within the REX II Power amplifier are several-fold:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eThe linearity of the gain stage improves.\u003c\/li\u003e\n\u003cli\u003eThe adjustments for the first and second gain stages become independent and therefore more easily optimized.\u003c\/li\u003e\n\u003cli\u003eThe tube current source components operate at much lower stress level, thus improving reliability.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eIn addition, more than one type of vacuum tube can be used in the second-stage current-source. This allows each user to fine tune the Rex II Power amplifier’s sound to best meet their individual needs. No matter which choice the user selects, this dual current source implementation extends the performance of the REX II Power amplifier to another level. The final result is an impressive improvement in the palpability of the phantom musical event.\u003c\/p\u003e\n\u003ch3\u003e80 Watts per channel (Stereo) 160 Watts per channel (Mono)\u003c\/h3\u003e\n\u003cp\u003eThe REX II Power amplifier is a high-current all-triode design that offers a robust 80 watts per channel in the stereo version or a compelling 160 watts per channel as a mono block. The 6C33C-B triode output tube used in the REX II Power amplifier offers many times the current delivery of the more common 6550 tube used in more traditional push-pull designs. High impedance vacuum tubes like the 6550 require far more complicated output transformers than the low impedance 6C33C-B vacuum tube. Consequently, the REX II Power amplifier is quite comfortable driving low impedance loads. You can simply choose the stereo or monoblock version based upon your choice of speaker and room size. The high-current delivery of the REX II Power amplifier will give you the assurance of driving a difficult load with ease.\u003c\/p\u003e\n\u003ch3\u003eIntelligent auto-bias \u0026amp; electronic protection\u003c\/h3\u003e\n\u003cp\u003eThe advanced design of the REX II Power amplifier eliminates the traditional headache associated with most vacuum-tube power amplifiers; the constant need to set and readjust the proper bias of the output tubes. The REX II Power amplifier features an intelligent automatic bias circuit that adjusts for changing line voltage and aging tubes. For convenience, the intelligent automatic bias circuit contains LED indicators that show the status of each individual output tube. This auto-bias circuit also ensures that your REX II Power amplifier sounds wonderful within the first few minutes of listening. This is indeed very different from manually biased designs that must be adjusted for their thermally warm set point - and thus sound too cold and clinical before their tubes are fully warmed up.\u003c\/p\u003e\n\u003cp\u003eBalanced Audio Technology extends the plug and play nature of the REX II Power amplifier further with a novel “fuse-less” protection circuit. This electronic protection circuit eliminates the power supply rail fuses to provide both a more refined sonic performance, as well as a very user-friendly experience. All the user has to do in the event of an output tube being over-stressed is to flip the power switch; it doesn’t get any easier than that!\u003c\/p\u003e\n\u003cp\u003eNo tubes to bias. No tube fuses to replace. This is the best of modern engineering applied to vacuum-tube amplifier design.\u003c\/p\u003e\n\u003ch3\u003eIntelligent power upgrade\u003c\/h3\u003e\n\u003cp\u003eThe REX II Power amplifier is easily upgraded from the stereo version to monoblock configuration. Unlike competing designs, there is no need for the user to trade their amplifier in to obtain more power. With the REX II Power amplifier, the user can simply convert their existing REX II to a monoblock, and then order a second REX II monoblock to match. Technically, the stereo to monoblock conversion is accomplished by simply paralleling the inputs and outputs. This means that “the sound” only gets better as monoblock current delivery goes up by a factor of two and the monoblock noise floor drops appreciably as well.\u003c\/p\u003e\n\u003cp\u003eA little known fact is that you can even parallel the REX II monoblocks by daisy-chaining them together. Do you want 320 watts per channel of high current, zero feedback, fully balanced power? Just use two REX II monoblocks per side!\u003c\/p\u003e\n\u003ch3\u003eSummary\u003c\/h3\u003e\n\u003cp\u003eThe REX II Power amplifier from Balanced Audio Technology is the culmination of nearly two decades of research into what constitutes the ultimate vacuum-tube power amplifier. Right out of the box, it is unlike most vacuum tube power amplifiers in being a fully balanced symmetrical design. This balanced symmetry, when combined with a high current, zero-feedback, all triode, dual vacuum-tube current source topology makes the REX II Power amplifier special indeed. Add the plug and play nature of automatic biasing and automatic protection to the list, and you have a thoroughly modern vacuum-tube amplifier that, by design, performs well above the rest.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eOutput Per Channel (8 Ω \/ 4 Ω):\u003c\/strong\u003e 80 W \/ 80 W \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOutput in Mono Configuration (8 Ω \/ 4 Ω):\u003c\/strong\u003e 160 W \/ 160 W \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 5 Hz to 200 kHz\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTHD (Full Power):\u003c\/strong\u003e 3.0 % \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGain (Nominal into 8 Ω):\u003c\/strong\u003e 26 dB\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInput Impedance (Mono):\u003c\/strong\u003e 108 kΩ \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNumber of Power Cords:\u003c\/strong\u003e 1\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eInput Impedance (Stereo):\u003c\/strong\u003e 215 kΩ \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePower Consumption (Idle \/ Full):\u003c\/strong\u003e 500 W \/ 1000 W\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube Complement:\u003c\/strong\u003e 4 x 6H30, 6 x 6SN7, 2 x 6V6, 4 x 6C33C-B \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e 17\" x 9\" x 24\"\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRemote Control:\u003c\/strong\u003e No \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 100 lb\u003c\/p\u003e","brand":"Balanced Audio Technology","offers":[{"title":"Default Title","offer_id":42418467930296,"sku":"REX-II-MONO-BLK-OPEN","price":23995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/BAT_REX_II_Power_Front.jpg?v=1741630176"},{"product_id":"balanced-audio-technology-vk-80i-integrated-amplifier-open","title":"Balanced Audio Technology VK-80i Integrated Amplifier (OPEN)","description":"\u003ch1\u003eBalanced Audio Technology VK-80i Integrated Amplifier\u003c\/h1\u003e\n\u003ch2\u003eFully balanced triode architecture, automatic bias, high-current 6C33C-B power tubes\u003c\/h2\u003e\n\u003cp\u003eThe graceful industrial design is based on BAT's flagship REX 3 system, and incorporates many of that series' technological advances.\u003cbr\u003e\u003cbr\u003eDelivering 55 W per channel, the 6C33-B triode output tube offers many times the current delivery of the 6550\/KT90 variants usually used in tube amps. This means you get the natural harmonic texture and instrumental timbre of triode design with no loss to bandwidth and dynamics, offering finesse, inner detail, and scale.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e“Fuse-less” protection circuit for enhanced sound and user-friendly operation\u003c\/strong\u003e\u003cbr\u003eIn the event an output tube becomes over-stressed, all you need to do is turn the VK80i off and on again to restore normal operation. The elimination of internal channel and tube fuses contributes to a greater sense of ease and more natural reproduction of music. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIntelligent auto-bias design\u003c\/strong\u003e\u003cbr\u003eThe advanced engineering within the VK-80i eliminates the traditional headache associated with most vacuum-tube power amplifiers—specifically, the constant need to set and readjust the proper bias of the output tubes. The VK-80i features an intelligent automatic bias design that adjusts for changing line voltage and aging tubes, with each output tube having its own dedicated bias circuit. \u003c\/p\u003e\n\u003cp\u003eThe sum of this engineering excellence is an amplifier with the midrange clarity, power, and dynamics that have made BAT one of the most respected brands in high-end audio.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eAn all-metal remote control is included.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eOutput per channel at 8Ω\/4Ω:\u003c\/strong\u003e 55 W\u003cbr\u003e\u003cstrong\u003eFrequency response:\u003c\/strong\u003e 8 Hz to 200 kHz\u003cbr\u003e\u003cstrong\u003eInput impedance:\u003c\/strong\u003e 215 kΩ\u003cbr\u003e\u003cstrong\u003eTube complement:\u003c\/strong\u003e 4 x 6SN7, 4 x 6C33C-B\u003cbr\u003e\u003cstrong\u003ePower consumption:\u003c\/strong\u003e 400W idle, 800W full power\u003cbr\u003e\u003cstrong\u003eInputs:\u003c\/strong\u003e 1 x XLR, 3 x RCA\u003cbr\u003e\u003cstrong\u003eVolume control:\u003c\/strong\u003e Resistive ladder, 90 steps, 1 dB per step\u003cbr\u003e\u003cstrong\u003eDimensions (WHD):\u003c\/strong\u003e 17\" x 8\" x 16\"\u003cbr\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 45 lb\u003c\/p\u003e","brand":"Balanced Audio Technology","offers":[{"title":"Silver","offer_id":43507936231608,"sku":"BAT-V80I-SIL-OPEN","price":8995.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1564\/1247\/files\/BAT_VK_80i_Integrated_Amplifier_Silver_Angle_Left_2048x2048_a8513ee8-60ce-4a91-8401-72fc893085c4.jpg?v=1741629886"}],"url":"https:\/\/upscaleaudio.pro\/collections\/balanced-audio-technology.oembed","provider":"Upscale Audio","version":"1.0","type":"link"}