PDP8A chassis 50Hz

From: Steve Thatcher <melamy_at_earthlink.net>
Date: Sun Sep 19 15:34:26 2004

lowering the capacitance would work. The transformer may have a tap on it
where the cap connects to use 60 hz also. The chassis was "wired" for 50 hz
so the tag would have that rating on it. I would expect DEC would have kept
one transformer in stock and customized at mfg (maybe).

best regards, Steve

At 02:30 PM 09/19/2004, you wrote:
>On Sun, 19 Sep 2004, vrs wrote:
>
> > > look at the capacitor connected to the transformer. That is a constant
> > > voltage transformer and will need 50 hz to work correctly.
> >
> > Hey, I have one of these on a shelf as a "spare" 8/a chassis (with almost
> > enough spare boards to make a spare 8a :-)). I'd like to know if the 50Hz
> > turns out to be a strict requirement or not. If so, is there is any easy
> > way to convert the thing for 60Hz?
> >
> > Thanks!
> >
> > Vince
> >
>
>
>Probably replacing the capacitor (Oil or PCB) with one about 70% the
>capacitance of the current one would be the easiest thing. This is to shift
>the resonance up to 60 Hz. Be very careful of the resonant capacitor circuit,
>it has quite high voltages...
>
>Peter Wallace
Received on Sun Sep 19 2004 - 15:34:26 BST

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