Vintage Synth Repair

> ...so, if a piano-tuner can't tune it, I guess i'll be stuck with my
> own ears and a chromatic tuner I guess :-)

Your ears will serve you well, but the tuner will only get you in the ball 
park.
There are so many notes and it's so painfule to do that (I think) it's a big
enough challenge getting  them tuned to each other -- making it absolutely 
on
pitch is very tough.

> Off to find my soldering-iron...

It better be a big soldering iron.  The process is more like soldering 
copper
pipework than electronics. You need a LOT of heat.

I haven't done one since the early 90's and I can't say I miss it.

GB