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Old 7th January 2012, 06:03 PM   #1
timwebb is online now timwebb  United States
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Default 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!!!
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Old 12th January 2012, 04:53 AM   #2
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Check all Zeners!!!! Replace bias trimpot, almost certainly shot!!
Check emitter resistors!!!
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Old 31st January 2012, 07:13 PM   #3
LAJ is offline LAJ  United States
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Default 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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