Vintage Simmons Drums (UK) Users Group

> I have replaced the capacitor on the +5V rail but there is still around 1V 
> AC half wave noise on it. Both before the regulator and after the regulator. 
> This leads me to believe that I need to replace the rectifier bridge with 
> one that can output more current.

The diode bridge has failed, with one diode going short-circuit.  This is surprisingly common - far more than failed capacitors which never go unless they get cooked off by a shorted rectifier!

Any very large diode bridge will do.  I would tend to make one up out of discrete 10A 400V diodes, but only because I've got hundreds of them to get through ;-)

Gordon MM0YEQ