JCA22H Depth Mod

I implemented the Depth mod, sourced from many Jet City online modification threads, on my Jet City JCA22H head.

0.0047µF Capacitor parallel with Lugs 1&2 of a 1Meg audio pot. This parallel combination is spliced in between the 'FB' terminals of the PCBs.

I had to turn up the Bass (~3:00) while turning down Treble and Presence (~10:00) at low volumes prior to the mod. The EQ has a more usable range with moderate Depth settings.

PCB

Mod Installed

Depth Pot on Rear Panel

Video of the Effect of Depth Settings at Low and High Volumes