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/diy/ - Do It Yourself

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1557827 No.1557827 [Reply] [Original]

Supp /diy/, i’ve bought rare 90s solid state guitar amp for dirt cheap and it’s broken. Somehow DC is running trough speaker and all i hear is hum (i can hear guitar too, but only after putting volume pot to 10). Which part of amp can be probably faulty? What parts need to be checked at first? Amp is Rath-Amp Retro 80.

>> No.1558372

May be a shorted electrolytic capacitor on the final amplifier stage.

>> No.1558713

Same thing happened to a friend's amp recently. His issue was the amplifier itself. Check for any burnt spots and check voltages?

>> No.1558780

Low output and dc hints towards a dead output transistor, one side of the push pull output is not functioning so the dc is not canceled and output is a fraction of what it should be.