This single channel equalizer uses passive LC circuitry with class-A triode vacuum tube stages for the input and output.
The tube circuitry is largely derived from the VT2 mic preamp design, so the equalizer has much the same sonic character as the preamps.The LC -style passive equalization circuitry is based on the the classic designs that are still the best-sounding way to achieve high-quality tonal control. The input line-level, transformer balanced-bridging. An active vacuum tube input section has adjustable gain to accomodate input signals as low as -10dBm. The input transformer is made by Jensen.
The output stage utilizes the same custom Jensen transformer used on the VT1/VT2 mic preamps. All controls are stepped for precise repeatability and uniform matching between units. High quality rotary switches are used with1% metal-film resistors. All audio capacitors are polystyrene or polypropylene. The inductors are custom made by Jensen Transformeres Inc. Like the VT1/VT2 preamps, the Equalizer has been designed to provide an exceptional tool for audio professionals. The design frequencies and curves were determined by ear after extensive listening to a variety of program material, both individual tracks and mixes. The result is a highly-musical equalizer with plenty of range for enhancing any track or mix.