30 Mar
2020
30 Mar
'20
7:51 p.m.
On Mon, Mar 30, 2020 at 3:43 PM Bob Rosenbloom via cctalk
<cctalk at classiccmp.org> wrote:
In restoring my PDP-8/s, diodes were the problem.
Turns out they have
steel leads that rust. Easy to see with a microscope.
Badly rusted ones broke the glass body.
Good to know. My PDP-8/S was stored indoors but my Straight-8 was in
a storage locker for years before I got it.
I have a stereo inspection microscope. I'll definitely peer at the
diodes as part of the cleaning/evaluation process.
But I also have to line up a bunch of spare bulbs. The leads on more
than half of the ones on my -8/S are fractured where they enter the
glass.
-ethan