Vintage Synth Repair

Thanks to everyone for the help.

I did re solder and then replace the jack but no joy there.

> I would argue against replacing the caps as the stages of the amp are  
> all DC coupled withe exception
> of C601, the 1 uf coupling cap at tyhe input staGE. My money( we are  
> all guessing here) is on the input differential
> stage as the culprit, specifically TR601,that's the 5 legged dual  
> transistor. 2SC2259?
> if you are just determined to replace caps, try c601 first.

It was the first thing I tried, but unfortunately it wasn't the problem.

I'll try and track the transistor pair down.

Thanks 
Royce