V5 Muff issue.

[braaandooon]

Pulled out my V5 op-amp muff for playtime today and noticed it was sounding pretty shitty. Sustaining notes tend to fizzle out, and when playing with a light pick attack chords and notes seem choked like barely any input signal is getting through.

Other symptoms are that I get no signal unless the sustain pot is set at noon or higher, and the tone bypass switch seems a tad janky.

So far I've cleaned up a cold solder joint on C2 of the schematic with little improvement, but everything else looks pretty good, outside of the legs on R4 seem oxidized somewhat. Not sure if that would be a cause for my symptoms though.

I typically suck at soldering, and troubleshooting the not so obvious, so any advice helps. I also dont own a voltmeter so have no way of checking voltages right now. Suggestions before I decide to throw money at my problem?

[mcfx138]

Hmmm... If you don't have a DMM it might be tough checking power in. Is the indicator LED doing anything weird? Sounds like it could be a power issue among other things. Check the power connections visually to ensure that there is no frayed wire. I've had those pots crap out on me many times as well. Perhaps a very small amount of de-oxit on the pots to clean them up a bit. Hope this helps some! Good luck. :-)