[sdiy] ems vcs3

[jhaible]

> Basically, there's hum all over, and all the oscillators distorts.
>
> I've seen this first hand before on a Synthi A and the number one suspect
is
> the electrolytic caps at the diode-bridge in the powersupply. What has
happend
> is that they got old (as they tend to do) so that they no longer has the
power
> to hold the voltage up until the next peak. Replace them with new
capacitors
> of same capacitance and voltage. There are neat high temperature ones
which
> can handle heat a little better than the old ones did.

Yes, and if you have one of these early shunt regulator power supplies,
the problem may be worse. Increased mains voltage since the days
when they built this (erly version), so you may need a larger power
resistor (higher resistance _and_ a higher power rating).

I have no practical experience with this (decided to go for a different
supply on my clone).

JH.