Europower EP2500

timwebb · 7th January 2012, 06:03 PM

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

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.

7th January 2012, 06:03 PM	#1
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	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!!!

31st January 2012, 07:13 PM	#3
LAJ diyAudio Member Join Date: Mar 2008 Location: Atlanta Ga. USA	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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12th January 2012, 04:53 AM	#2
diy didi diyAudio Member Join Date: Sep 2009 Location: Pretoria	Check all Zeners!!!! Replace bias trimpot, almost certainly shot!! Check emitter resistors!!!