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Vintage Synth Repair

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RE: [vintagesynthrepair] Amp clicks

2009-08-02 by timothy kosiorek

if your original fix helped I would look real close to the solder connections on that jack,especially if it is circuit board mounted,just try resoldering them if that dosen't help try using a scope on the audio path to find where the pops and click start,follow a sine wave signal from the input to the output.
Tim K.


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> To: vintagesynthrepair@yahoogroups.com
> From: rpcfender@...
> Date: Sun, 2 Aug 2009 02:44:27 +0000
> Subject: [vintagesynthrepair] Amp clicks
>
> I have a Fostex Model 600 power amp.
> A while ago one of the channels started to quietly pop and click.
> I pulled the 1/4inch jack (from my mixer) in and out and it cleared up (the plug socket is not switched) so I thought it was a dirty contact.
> The problem returned and was fixed several times.
>
> Now the pops and clicks are intermittent and the replugging has no effect.
>
>; It doesn't seem thermal because if it is left alone with just the quiescent current flowing though it, it can start noisy then it can be quiet for and hour and the pops just start up again.
> The DC measurements are close to the cct diagram.
>
> Before I start replacing all the caps, should I be looking at some other components?
>
> Thanks
>
> Royce
>
>
>
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