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Old 22nd August 2009, 09:17 AM   #1
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Default sherwood s-8900

Im working on a sherwood s-8900 and cant figure out why both channels are not working.I have audio getting to the output stage ,nothing is shorted.Its an old school amp but Im trying to fix it for someone
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Old 22nd August 2009, 09:19 AM   #2
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Old 22nd August 2009, 09:44 AM   #3
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there can be a number of reason (s) but the most serious are two

one all switches and pots will need very good cleaning with a good quality spray for cleaning ( please read related threads about all that since not every spray is switable for that and also how much spray is an issue )
two beyond that you will need to make shure that all small electrolytics still work properly ....there is a very good chance that they are seriously gone to mars ....

after that you may wana ta ke a look at that and find it very handy

vintage amplifier repair/upgrade manual
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Old 22nd August 2009, 04:03 PM   #4
sregor is offline sregor  United States
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IF everything is okay to the outputs - possibilities are speaker selector switch, fuses or fuse holders if they use them. (don't have schematic handy) Another possibility us that some of the old sherwood amps use series connection for speakers - nothing works in a + b speaker mode unless speakers are hooked to both.
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Old 22nd August 2009, 06:05 PM   #5
djk is offline djk
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Look for DC at the amplifier's output (at the speaker relay).

If it's OK, the speaker relay is not pulling in.

The timing cap in the relay circuit is probably dried up.
Candidates for the Darwin Award should not read this author.
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