sounds like a dirty jack, a bad switch, or a dirty pot.
It could also be the electrolytic cap.
My recent hobby has been fixing broken Russian Muffs. I’ve bought 4 black models, and 3 have shown up with big problems (dead)
Most likely to least likely:
1. Battery connector needs to be replaced.
2. a bad input jack can start behaving like that if you’re moving the pedal around while messing with the battery/battery clip
3. Bad switch. You can check if this is the problem with a gator clip. Wire it to be “always on”.
4. The electrolytic cap might be dry/toast. That’s the blue or black can the sticks up.
I was afraid of this.
Is there any way to figure out which one is bad without desoldering each one, and testing it with an analog meter? (assuming none of them are visibly blown)
I know this is an ancient bump, but I’m having the exact same problem with my V7D Big Box Black Russian.
I’m hesitant to start replacing caps.
Has anybody figured this out yet?
Thanks!!