Vintage Synth Repair

Hello guys and sorry to jump in like that but I would suggest to change the big caps as a priority and then check the bridge rectifier again for leakage of AC current.

I had a big problem with a D&R console's psu in which the voltage regulators kept on going Kapput. Turned out that the big Electrolytics were bad and that induced a big stress on the rectifier bridge, which in turn had the consequence of not only letting DC pass as expected, but also AC at the same time !

I did test for AC leakage on the rectifier after the newly installed voltage regulator worked for a couple of seconds before shorting...

After new BIG caps, new bridge rectifier and a 2nd new voltage regulator, everything was sorted.

Good luck !