I plugged in my SAS tube distortion pedal, and it crackled, fizzled, and the light went out, pretty much immediately upon plugging it in line of playing. I checked the inputs and outputs, they looked correct. I have not opened it up yet to inspect what happened. I checked the power supply, and it was correct.
Maybe it was the end of its life? Is there a schematic or service manual that I can use to investigate the pedal?
I will be testing the power supply later, but I figured I’d start asking for help ahead of time and check back in.
Welcome to the forum!
Are you using the stock 12VAC adapter?
Schematics are only released to authorized service outlets, but if you can send some photos of the inside, I’ll be happy to assist.
Dave.
The pedal was sold without a power supply 13-14 years ago from guitar center discount table. The power supply was after market 12VAC 500mA Jameco.
I just tested the power supply and it’s testing at 24 volts! Something must have failed inside it. Oof. Nothing looks burned inside but I’ll send a picture.
Edit: I tested with a different multimeter and it read 12.9/13 volts. So the power seems ok. It’s a 2 prong wall wart and has had no problems for 13 years.
Edit 2: I just tried plugging in the power supply into the unit, and the LED lit up, then the power went off again. I waited a few seconds and then attempted plugging in a third time but thing time I quickly unplugged the wall wart. The power turned on while plugged in, and then the second quick plug in it turned on again, but then died, like there was too much current/something into somewhere and it shut itself off. Something triggered.
Now for my final test, I turned the pedal into the off position, then plugged it in. The trigger didn’t trip, and I could leave it plugged in. I tripped the pedal switch, and it would turn on. No guitar attached. No amp attached. So now, it’s now triggering. Maybe there is a fault with leaving it in the on position and plugging it in? I do not recall this before. Maybe I got lucky all these years.
Short of determining if any of the power supply diodes on the PCB are bad, I would suspect the wall wart doesn’t have enough headroom. Try to find one with 700-800 mA and see what happens.
