My solid-state amp isn't putting out any sounds lately. But when I turn it off there is a short time where I can hear my guitar playing until the amp turns completely off. What can cause this strange behavior?

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    Sounds a bit like a worn capacitor somewhere… Unfortunately without more information on the complete setup it is hard to give an accurate answer… – Tom Nov 2 '20 at 14:57
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    @Tom What more Information would you need? I should be able to provide all the Infos :D – maxiangelo Nov 2 '20 at 15:06
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    It could also be a failing component going into thermal shutdown. I'd suggest taking it in for service. – Duston Nov 2 '20 at 15:19
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    I would tend to agree with @Duston if you are not too much into electronic. Have you tried the guitar on another amp? Is the sound completely off or very very low? Does it happen gradually? – Tom Nov 2 '20 at 15:37
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    I'd like to know what the amp is - some old SS amps should be dropped unceremoniously in the skip, whilst others are absolutely always worth repairing. BTW, if you're having caps replaced, get them all replaced, not just the duff ones. The BBC used to replace all caps in all equipment on a 5-year diary. After having replaced the valves in an old Vibralux with no sonic benefit, after a quick chat with the BBC brown-coats we also replaced the power caps - pure joy. It looks a bit odd replacing huge chewed toffees with weeny blue cylinders, wires stretched as far as they can, but by heck it works – Tetsujin Nov 2 '20 at 16:51

In order to diagnose the problem with this amp you'll need to trace a signal through the circuitry of the amplifier to find the defective component. If I had it on my workbench, the first thing I would look for would be defective field effect transistors (FET), I've seen a few amps act this way and replacing the FETs fixed the problem. If the problem isn't with the FETs, then I'd check for a defective zener diode, this can also cause an amp to act in this manner. Both parts are inexpensive and easy to replace, so it shouldn't break the bank to fix it.

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