The PDP11/04 has landed..

Robert Jarratt robert.jarratt at
Mon Feb 8 13:38:07 CST 2016

> -----Original Message-----
> From: cctech [mailto:cctech-bounces at] On Behalf Of tony
> duell
> Sent: 08 February 2016 15:25
> To: General Discussion: On-Topic Posts <cctech at>;
> jdr_use at; classiccmp at
> Subject: RE: The PDP11/04 has landed..
> >
> > I have one of these on my restoration list. I know the PSU does not
> > work, and that others have tried to fix it before me, who probably
> > know PSUs much better than I do. It has core  memory so I really would
> > like to get his one fixed. I have never seen a PSU for it come
> > available in the UK or Europe, so it looks like it won't be an easy
> > job. :-(
> Which mounting box is it? (The 11/04 could certainly come in 5.25" and
> versions, there may have been several versions of each). The common 10.5"
> one, BA11-K IIRC, is a fairly easy supply to work on, it's a big mains
> transformer and the DEC switching regulator bricks.
> The common 5.25" one, with the H777 PSU, is a bit more nasty, the H777 is
> normal-ish SMPSU. I have worked on both.

Sadly it is a H777. I have not even opened it up to look at yet. Until
recently I was fixing the PSU in my rtVAX 1000 (H7864, in a BA23) and the
H7874 from my VAX 4000-500, then I would still like to fix the H7140 from my
11/24, before getting to this one.



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