Odp: [sdiy] Oberheim OB-Mx PSU question

[Roman Sowa]

In Poland they change 220 to 230 by 1V per year and this
process is nearly
finished. But this is all crap. According to specs, voltage
can change by +10%
and -15%, so that's up to 242V. 230 is probably only monthly
mean value.
Several times we had brakers go off one by one at work. It
turned out power
plant decided to give us more than we pay for, so there was
260V.
Fortunately they are so generous only couple times per year,
for no more
than 1 hour.

Roman

----- Original Message -----
From: Ingo Debus <debus at cityweb.de>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, November 20, 2002 4:13 PM
Subject: Re: [sdiy] Oberheim OB-Mx PSU question


> Peter Grenader wrote:
> > The hum Sebastian is experiencing is due to the fact
that the OBMX was
> > released in 1993, and at that point Gernam AC was runing
about 220.  I've
> > been told now it's floating at around 235.  It's
transformer is not designed
> > to handle this additional voltage, thus it hums.
>
> Yes, the nominal mains voltage here is 230 volts now. It
was 220 volts
> about 20 years ago.
> I'm pretty sure in 1993 it was already 230 volts.
>
> Anyway if this was designed for 220 volts and doesn't work
properly
> with 230 it's a poor design IMHO. That's less than 5%
overvoltage.
>
> Ingo
>
>