-----Original Message-----
From: cctalk-bounces at
classiccmp.org [mailto:cctalk-
bounces at
classiccmp.org] On Behalf Of Eric Smith
Sent: 14 May 2012 09:17
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: PDP-11/35 power supply woes
Pontus Pihlgren wrote:
Otherwise you could keep your eyes open for an
11/34 or 11/44 or
spares. I _think_ they have the same PSU
The 11/44 uses the H7140 power supply which was also used in the 11/24
and VAX-11/730. It is quite different than the H765 power supply used in
the 11/34, 11/35, and 10.5-inch-tall 11/05 and 11/10.
I have a H7140 that I am *still* trying to repair after more than a year of
failure and despite the valiant attempts of one person on this list to help
me, and it is in much better condition than the one in the pictures.
However, I am hampered by my poor knowledge of PSUs (which is gradually
improving), my slowly developing desoldering skills, and my unwillingness to
spend a lot of money on oscilloscopes, bench PSUs, ESR testers and goodness
knows what else.
I can sympathise with the OP about getting another PSU just so he can get
the machine to work. In fact, if anyone in the UK has a H7140 they don't
want it would be great to get my 11/24 to do something too. I still want to
repair the one I have and after all the effort spent my determination is
only increasing, the more it rebuffs me the more I want to beat it into
submission (sometimes literally! :-) ) and make it work.
Regards
Rob