Vintage Synth Repair

Royce
 
I would start by replacing the socket, just in case there is a bad contact
between the jack and the socket.  This would automatically take care of any
broken solder joints on the socket connections.  Should this not cure the
fault completely then start replacing caps.
 
Regards
Brian G3OYU
www.g3oyu.co.uk
 
  _____  

From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of rpcfender
Sent: Sunday, 02 August 2009 03:44
To: vintagesynthrepair@yahoogroups.com
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