PDP 11 gear finally moved

tony duell ard at p850ug1.demon.co.uk
Fri Jul 17 13:31:12 CDT 2015

> It is generally a good idea to re-form electrolytic capacitors in power
> supplies, and to bench check the power supplies (under some kind of
> load) before actually applying power to the whole unit.

I am not sure either would have done much good here. The OP said it
ran OK for an hour or so, when you test a PSU on dummy load you 
typically do it for a lot less time than that, Incidentally, DEC PSUs
of this type run fine with no load in my experience

Also I have found the capacitors in these units to be very reliable. They
can fail, of course, but virtually all the DEC bricks I have are on their
original capacitors. I think I've replaced more chopper transistors than
capacitors in these.


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