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timwebb 7th January 2012 06:03 PM

Europower EP2500
hi everyone. i have a ep2500 that im repairing. the output transistors are shorted.anything else i should on this amp? any common issues?..thanks!!!

diy didi 12th January 2012 04:53 AM

Check all Zeners!!!! Replace bias trimpot, almost certainly shot!!
Check emitter resistors!!!

LAJ 31st January 2012 07:13 PM

Check final output op amps for DC.
Should be none. Usually if outputs short it will carry the final op amp.
Also physically remove the bias pots and check them for open.
The OTA op amps were OK in mine.
When I rebuilt mine I found that 13 ohms is the perfect setting for the bias pots (so I installed fixed resistors).
The factory pots are really crappy.

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