Hi EHX Forums,

My first post on this forum so I hope I’m posting under the right subsection!

I wonder if you guys can help me out, I’m having issues with my beloved Black Russian Big Muff (6 screw hole enclosure version), basically it suddenly has stopped working and I don’t really understand why. I will upload a few pictures of the contents of the pedal for your viewing.

I first noticed there was an issue during a band practice the other week when NONE of my effects were working. Then I realised that my effects were working, but only with the Big Muff engaged. When the pedal was bypassed it was as if it was cutting the signal off to everything else on my board. Once I realised that it was the big muff that was the issue I removed it from the board to test.

Now while testing the pedal off the board, I get completely no signal at all with the pedal off in bypass. With the pedal engaged I get the slightest trickle of an effect coming through on a signal that is very low volume even with all the pots in their max positions.

I cant understand why this pedal has suddenly stopped working as I have used and gigged with this pedal for a number of years now with no issues at all. Even my pedal board is encased in a very strong flight case so it’s not like its likely to have been damaged?

The mod on this pedal I had done (fitting a 9v input to battery snap) is very minimal indeed and was done a number of years ago now so I can’t imagine that this could be the cause but I thought I would still mention that it is there and I have included a picture of this. The only other involvement I have had on this pedal was using some switch cleaner on the pots a good couple of months ago to stop the scratchy sounds I was getting when turning the pots. This fixed that issue and the pedal worked great afterwards for a number of uses so I can’t see that this was the cause of the issue either.

Is it possible that the signal is being sent to ground somewhere within the circuit? That’s the only thing I can think it could be..

Any advice on how I could fix this pedal would be much appreciated.