The Hazelrigg Industries DLC is based on the passive equalizer circuit in the VLC (originally found in the D.W. Fearn VT-5). It shares the same filter capacitors and handwound inductor as the VLC, though the audio path is slightly different. The input audio circuit comes from the D.W. Fearn VT-2, while the output uses a low THD/high gain solid state amplifier design. Like the VLC, the DLC uses transformers in both input and output stages.

Boosting and cutting simultaneously can create complex equalization curves. Try turning up all knobs except the bass boost, switch frequencies to the desired settings, then bring the bass boost up until the sound is balanced.

Vacuum tube input stage (6072a)

Hand-wound inductor

Amplifier and EQ circuits designed by D.W. Fearn

Transformers in both input and output stages

Front panel microphone/instrument input

High cut control

High boost control

Low boost control

Low cut control

High cut frequency select switch

High boost frequency select switch

Low boost frequency select switch

Low cut frequency select switch

Bypass switch