Vintage Synth Repair

--- In vintagesynthrepair@y..., "einarekstrom" <einarekstrom@y...> 
wrote:
> Hi,
> 
> I recently purchased a Moog Source from the US, which I now got 
> rewired for 240V(thanks to Peter M. Blacket for the schematics!). 
To 
> my relief the membrane switch panel seems to be intact, but there's 
> another annoying problem: 
> 
> When I turn it on it's working fine for about 10-15 minutes, 
> suddenly the keyboard goes crazy. It keeps playing the wrong notes 
> from the wrong keys, and sometimes it can re-trigger the envelopes 
> several times while pressing a key. Funnily this doesn't seem to 
> affect the lowest octave. Sometimes it may start to work properly 
> again after a couple of minutes. 
> 
> I wonder if this has something to do with the power supply 
> generating heat, after a while it gets so hot that i almost burn my 
> fingers on the back panel.
> 
> Please reply if anybody has a clue what may be the cause(and cure) 
> of this problem. Somehow I got the feeling this is not the 
> famous "crazy source" syndrome, since it looks like the previous 
> owner did something to the digital regulators on the PSU board.
> 
> Thanks in advance,
> Einar Ekstrom