Hi,
Update on troubleshooting psa-1. Since original forum posting, the device has been put on the shelf. Not had equipment to find fault.
It still remains on the to do list. Will one day solve and post findings.
Cheers

Hi, Still have not fixed the amp. Turned out the new replacement transformer was shorted, same as the original transformer as a result of whatever the fault is in the circuitry. This happens very very quickly, perhaps almost instantaneously. Problem has to be a short to ground that occurs with no in...

Hi av500 Cheers for the additional info, you are obviosuly streets ahead of me with your knowledge. Hi Bajaman I tried the finger on the op amp test. Very subjective, some I thought were slightly warming but on subsequent test could not confirm first observations. Was trying to scheme how I could ob...

Hi av500 and bajaman Thanks for replying. Have yet to perform your suggestions. Will let you know what I find. Further question, av500, on your sketch of the amplifiers circuits you list the unknown IC's (ones with the code ground off) as DS1267. I'm sure that somewhere else on a forum (perhaps this...

Hi, Am trying to repair a PSA1. Any hints would be appreciated. PSA1 given to me to look at after a replacement transformer burnt out within 2 minutes of powering on. Trying to troubleshoot with 2 multimeter's and a basic level of electronics understanding, so is not very effective at all, want to r...