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Videos: Testing DEC H740 PSUs and PDP-8/f power on and simple tests

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intabits:
A couple of PDP related videos.

First video is testing the H740 power supplies from the PDP-8/f and PDP-11/05, with a dummy load.
I made the mistake of running the first PSU from a variac with the load attached, and damaged it.
The second PSU blew a fuse under load, not sure why.

After getting replacement parts, I fixed the 8/f PSU, tested it and installed it to the computer.
(repair of the 11/05 PSU can wait)




Second video is powering up the PDP-8/f for the first time in over a decade.
At first I thought it wasn't working (yet another dumb mistake), but then realized it was OK after all.   
I was able to enter and run a couple of small test programs.


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