Power switch kuh - thump !!!

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- fffcj
  
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posted
19 years ago

Tue, Aug 24, 2004 5:40 AM

I have a guitar preamp ( Marshall JMP-1 ) . When it powers up , there is very loud Kuh - thump on the output . How do I modify it to get rid of this annoying trait ?

Thanks

Chris

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- Gene
  
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posted
19 years ago

Tue, Aug 24, 2004 8:14 AM

Connect the contacts of a suitable relay in series with the amp output and have a delayed turn-on of the relay (few seconds), in other words he contacts are connecting the speaker to the amp output only after the power-on transients have subsided.. This works fine only if the amp output stage is in push-pull configuration. Gene

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- Glenn Gundlach
  
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posted
19 years ago

Thu, Aug 26, 2004 3:52 AM

1: OP said its a preamp so it might be turned on independently of the amp. 2: My real question-- why won't your relay solution work with a single ended amp?

GG