The DW Fearn VT-4 is a Single Channel Vacuum Tube Equalizer with LC Passive Circuitry.

The DW Fearn VT-4 is smooth and sweet, and can be very subtle at mild settings, but quite strong with aggressive use of the controls. Creative use of the low boost and cut will create a powerful bass that has to be heard to be believed. The high boost adds just the right brightness to vocals, guitars - any sound, or even an entire mix. Even with extreme settings, the VT-4 will never sound harsh.

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 VT-1/VT-2 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 classic designs that are still the best-sounding way to achieve high-quality tonal control.

The input is line-level, transformer balanced-bridging. An active vacuum tube input section has adjustable gain to accomodate input signals as low as -10 dBm. The input transformer is made by Jensen. The output stage utilizes the same custom Jensen transformer used on the VT-1/VT-2 mic preamps.

All controls are stepped for precise repeatability and uniform matching between units. High-quality rotary switches are used with 1% metal-film resistors. All of the audio capacitors are polystyrene or polypropylene. The inductors are custom-made for us by Jensen Transformers Inc.

Low Cut at 30, 40, 100, or 400 Hz, 0 to -18 dB shelving in 2 dB steps
Low Boost at 20, 40, 80, or 140 Hz, 0 to 12 dB shelving in 2 dB steps
Mid Cut at 200, 300, 400, 500, 600, or 700 Hz, 0 to -30 dB in 3 dB steps
High Boost at 2, 3, 4, 5, 8, 10, 12, or 16 kHz, 0 to 12 dB in 2 dB steps
High Bandwidth Q of 0.6, 0.8, 1.0, 1.4, or 1.7
High Frequency Cut at 1.5, 3.5, 8, or 20 kHz, 0 to -14 dB shelving in 2 dB steps
Gain adjustable from -9 to +9 dB, referenced to +4 dBm, in 3 dB steps
Frequency response: +/- 0.2 dB 20 Hz to 20 kHz
THD: less than 0.20%
Noise: less than -90 dBm

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