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PostPosted: Thu Jan 30, 2020 6:27 pm 
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Joined: Sun May 24, 2009 6:20 pm
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My Amp Selector has a strong hiss on output A. Not so much a whine or a hum. And it's only output A. I have attempted all combinations of ground lift switches. Changed the instrument cables. Different amps. All tests lead me back to output-A. I have board rev 1.1 It worked OK a couple months ago. I put away in a drawer (cool dry area). Put the pedal back into use recently. And now the hissing problem. Opening up the box, I see no visibly damaged components. Nothing broken, or loose.
Any advice is appreciated.


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PostPosted: Thu Jan 30, 2020 6:36 pm 
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Joined: Wed Apr 26, 2006 5:14 pm
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Location: Truckee, CA
First step is to try rotating the positions of the 3 TL072 chips to see if the issue moves with one of the chips. Leave the 1044 in its place.

Often, an iffy solder joint can give way over time and cause some issues. Best practice is to remove the PCB from the enclosure, remove the chips from the sockets, and resolder each solder joint.

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