Vintage Synth Repair

>>the synth is an arp 2600. the current owner i am purchasing from had
the synth looked over by phil cirocco, and he said the transformer is
causing voltage drift over time, so assuming the part is reasonable,
im gonna start with that and then see if the problem still exists.<<

this only makes sense if there is something physically wrong with the
transformer- like corroded windings shorting out or something. in any
case, the regulator circuits (however they are designed) downstream of
this should either be taking care of the variations or dropping out
entirely. these symptoms, in addition to any deterioration in the
transformer, should & would have been picked up by any reputable synth
tech during his "looking over" the synth. being as it's a 2600, this
is no small matter- the thing is practically a valuable antique by
today's market standards. I though I recognised cirocco's name as a
reputable tech- perhaps someone else can confirm this? in any case,
you need to get a second opinion before throwing any money at this or
opening the thing up yourself. something sounds wrong here.

duncan (an actual engineer)