Discussion about the Korg PolySix synthesizer

It is not just the heat output of your power supply that is the limiting 
factor with regards to current draw. Every component that the load draws 
current through must be considered.

The transformer in particular. I have found that many Polysix and 
Mono/poly transformers operate quite warm and get warmer as they grow 
old. I've no idea what the original transformer's maximum current output 
is on these synths but if I was adding a bunch of stuff to my Polysix 
I'd certainly consider replacing the transformer so it can cope with the 
load I'd be drawing from it.

The transformer and the smoothing capacitors should also be rated for at 
least twice the DC draw.

A quick rule of thumb is that if you can't touch any device for more 
than ten seconds then it's too hot (and probably above 60C). That's in 
the UK mind and we have a much lower ambient temperature normally.

I'd recommend measuring the current output of each DC supply line 
without the additional circuitry, and then with all the additional 
circuitry. If it's more than 25% difference you're almost certainly 
stressing it out.

Tony

http://takla-makan.bandcamp.com/
http://www.oakleysound.com