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Proton AM452
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Old 27th November 2010, 09:45 AM   #1
Carlosraj is offline Carlosraj  United Kingdom
diyAudio Member
Join Date: Jan 2010
Default Proton AM452

Dear Everyone

I am trying to fix an old Proton AM452 amplifier that belongs to a friend of mine. He told me that the amp blew up his right channel speaker. When I turned on the amplifier, there was a humming noise from the right channel speaker. I suspected DC leakage, and when I measured, true enough there was a gradual build up of DC voltage slowly rising up to more than 30 volts. I do not have a schematic. I initially tested all the preamp and power amp transistors and capacitors and they appear to be OK. Can someone help me out with this problem. What can cause a DC leakage into the output? Please help.

Thank you

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