Help me banish the bees in my latest build

[Just1More]

Hi

Just about finished off a Silver LTD.  It sounds great except that it buzzes like a beehive with the volume and/or drive past about 12:00.  Very similar to the sound you get if you touch the tip of the lead guitar lead while it's plugged into the amp.

I don't recall having this issue when I tested out the circuit on my test rig before boxing it up.  It was a few weeks back so I can't say for certain, but it's pretty obvious - I'm sure I'd have noticed it if it was playing up then.

Testing done so far:

1. Sole pedal running off a regulated power supply: buzzes
2. Sole pedal running of a fresh 9V battery: buzzes - maybe slightly less but in the same ballpark
3. Checked grounds: there seems to be continuity between all the ground points and the input jack sleeve.
4. Switch opamps: JCR4558 seemed to make less noise than the original TL072 but it was still pretty bad.

Anyone got any other suggestions before I try and smoke the bees out?  All my other builds have been pretty well silent and I'm out of ideas at present.

Thanks

[Paul Marossy]

Cold solder joint somewhere?

[Just1More]

Thanks Paul.  Nothing like sleep and daylight to find issues.  I'd stripped off a bit too much insulation on one of the switch wires and it was making contact with another of the pins.  I'm surprised I got any sound at all.  All sorted now - what a fantastic sounding overdrive.  This is going straight on my board... just as soon as I work out what to take off to make room for it 

[Paul Marossy]

Cool, glad you figured it out!