The D.W. Fearn VT-4 is a single-channel equalizer that 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.
DW Fearn VT 4 Features
- Frequency response: +/- 0.2 dB 20 Hz to 20 kHz
- THD: less than 0.20%
- Noise: less than -80 dBm
- Low Cut at 30, 40, 100, or 400 Hz, 0 to -18 dB shelving in 2 dB steps
- Low Boost at 20, 40, 60, or 140 Hz, 0 to 16 dB shelving in 2 dB steps
- Mid Cut at 200, 300, 400, 500, 600, or 700 Hz, 0 to -16 dB in 2 dB steps
- High Boost at 1.5, 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 28 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