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The Sound of Musical Truth

The Balanced Audio Technology VK-90t power amplifier features a fuse-less protection circuit, active current sources for its two gain stages, intelligent auto-bias circuit with LED indicators, and high-current, all-triode, zero-feedback, fully balanced topology. Its 25th anniversary industrial design is complemented by new, silver-gold oil capacitors and ultra-transparent internal wiring in the signal path. With VK-90t, BAT realizes that serious listeners want unique technology, user-friendly experiences, and faithful-to-the-source sonics in high-end equipment. The equivalent of having two single-ended amplifiers per channel, VK-90t meets these demands and more—and sounds mesmerizing minutes after being turned on. VK-90t also means there are no tubes to bias; no fuses to replace; no pentodes imitating triodes; and no direct current at the tube output stage. VK-90t is the sound of the future—and musical truth.

Active Dual-Stage Current Sources for Improved Linearity and Accuracy

VK-90t extends the advantages of active current sources by including these in both the first and second gain stages of the circuit design. There are multiple benefits to implementing active current sources (solid-state as well as tube) for the first two stages. Specifically, the linearity of the gain stages improves; the adjustments for the first and second gain stages become independent and more easily optimized; and the active source components operate at lower stress level, improving reliability. The final result is an impressive improvement in the linearity, yielding a more accurate representation of the output signal to the original input signal. And that, in essence, is the measure of any amplifier.

Fully Symmetrical, All-Triode Circuit Banishes Conventional Drawbacks

In a world of cookie-cutter pentode/tetrode designs and frail single-ended counterparts, VK-90t stands apart. Its design is fully symmetrical from beginning to end. You can think of it as having two single-ended amplifiers per channel, with their waveforms summed at the output transformer. Since no direct current flows through the output transformer, the latter is a true wide bandwidth design that also reduces low-frequency distortion. When you combine VK-90t’s fully symmetrical circuit with its high-current, all-triode, zero-feedback, fully balanced topology, all of the drawbacks of push-pull and single-ended amplifiers are banished.

Design topology
Symmetrical single-ended bridge design

Signal Path
All triode signal path from input to output
Second generation silver gold oil capacitors
Second generation ultra-transparent internal interconnect

Ease of Use
Intelligent automatic bias combined with fuseless protection circuit

Global Feedback

Chassis Construction
All aluminum 25th anniversary design

Available as either a stereo or moblock from the factory
Stereo amplifier is easily converted to monoblock

Output per channel at 8Ω/4Ω (@ less than 3% THD)
75W Stereo / 150W Mono

Frequency Response
7Hz to 200kHz

Input Impedance (each phase)
Stereo 200 kΩ / Mono 100 kΩ

Input Sensitivity

Energy Storage
600 joules

26 dB

Power Consumption
500VA (idle)
1000VA (full power)

Tube Complement
4 x 6C33C-B, 6 x 6SN7, 4 x 6H30

17″ x 8″ x 24″


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