[sdiy] EMS VCS3 II negative power supply problems

Pete Hartman pete.hartman at gmail.com
Tue Sep 13 22:02:36 CEST 2022

Not entirely sure the schematics are there, but the base website is
archived at the Internet Archive:



On Tue, Sep 13, 2022 at 2:53 PM Mattias Rickardsson <mr at analogue.org> wrote:

> Hey,
> I'm trying to revive a VCS3 II where the power supply has issues on the
> negative regulation. With an incoming -25 V it puts out roughly -24 V
> instead of the supposed -9 V. Does anyone have experience with similar
> problems?
> (The transformer was fried on the negative half, so I'm running it from a
> bench supply. I have also replaced the regulating 741 and TIP3055 power
> transistor)
> ((The phutney.com site and its very readable schematics also magically
> disappeared, which didn't help)) :-)
> Best,
> /mr
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