Quote:
Originally Posted by Voland
Hi everyone
I have an issue with my AVT50 - when I turn it off, I sometimes (80% of the time) get a loud pop from the speaker.
As far as I know, the cause for this is the discharge of the capacitors, which still have some charge on them. Does anyone have an idea how to fix this problem?
Cheers
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Usually, solid state amps pop when you turn them on. Last time I had a problem with an amp popping when turning it off, one of the capacitors had a cold solder joint. Re-soldering the capacitor fixed the problem.
Troubleshooting: [if you don't know how to do this safely, or if you don't have the skills to do it, go to a technician, even if the amp is un-plugged, capacitors can hold enough charge to hurt you, especially the main filter caps] - I would start by opening up the amp, turning it on, and poking around, using a stick (or other non-conductive probe). Push and tap on components to see if you can find one that causes noise/crackling (out the speaker). Try pulling out the tube, and seeing if you still get the pop - if you don't, you know it is in the circuit before the tube, if you do, it is after the tube. If that doesn't reveal the problem, try dis-charging the electro-lytic caps, and re-soldering them. It could be a non-polarized cap causing the problem as well. If that doesn't work, you may be looking for a bad cap or cold solder joint, I am guessing. Best of luck. Please let me know if this helps
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Peter