17 Nov
2008
17 Nov
'08
6:12 p.m.
Pete Turnbull wrote:
I've taken my newly-acquired PDP-8/E apart to
clean out the dust and
[...]
Part of the reason for not powering it up is that
it's a 110V version,
and here in the UK my mains is 240V. Looking at the engineering
drawings (on David Gesswein's site, and Highgate) for the H724 (110V)
and H724A (240V) supplies, I see transformer taps shown for both
voltages, and on the face of it, it should be very easy to convert. Just
a matter of moving the connections from tags 6 and 9 of the relay (or
"realy" as the schematic calls it :-)) Has anyone ever done this?
If the print set shows the same part number for the transformer for both
the H724 and H724A, it will be fine. However, DEC sometimes used
transformers in 60 Hz gear that was undersized for 50 Hz, despite the
presence of appropriate taps for 240V mains. IIRC, the 120V/60Hz RX01
had this issue.
Eric