AA Electronics PCB Group

Hey everyone! Getting stuck on my SLO 100 build. Any help would be greatly appreciated, so thanks in advance!

I believe that the problem is between the Input Jack and the Return Jack, but I can't figure out where.

Symptoms: When instrument cable is plugged into the Input jack, no audio passes. There is a noise floor hum. All LEDs illuminate as intended. After a few moments, my current limiter gradually increases in brightness until it glows brightly (and remains bright). As the bulb reaches full brightness, the indicator LEDs for channel selection start to dim.

When I plug the instrument cable into the Return jack, the amp passes signal. The audio is full and works on both channels. Interestingly, the channel LEDs pulse in brightness slightly when audio signal is applied - there is a direct link with applied audio signal and the LED brightness.

I've pulled V1, V2, and V3 with no positive result - the issue persists.

Thanks again for the assistance. I feel that this one is super close to completely functional.