In article ,
mentioned...
On Thu, 04 Sep 2003 14:36:25 -0700, Lizard Blizzard
wrote:

I think you have that backwards. Back then, the radio and TV sets were
still using 5U4 TOOBS for rectifiers, whereas the electrical world
already had equipment with SCRs up to the size of hockey pucks that
could handle up to 1200 amps (http://www.cehco.com/sda.htm), and 1N1184
series of 35 amp stud mount rectifiers were common in equipment


That could be. I was just a young pup in the 60s, but I remember the
diodes were the top-hat kind that didn't fit into lamp-saver sockets.
I don't recall seeing anything other than variacs for lamp dimmers
either.

When I was in the army in the late '60s we were constantly replacing
those top hat rectifiers in the CRTs for the radars. In each lead,
they had 3 or 4 1N547s, each rated 600V, 1/4A, in series, with a cap
across each one, to rectify the B+. The deflection plates used pretty
high B+ so the diodes were always failing. If we would have been
smarter, we wwould have put more in series, but then Military
Intelligence was an oxymoron. :-P

They used to use fuse holders to hold the top hats and help keep them
cool. Later they came out with a metal package that was a bit longer
and smaller in diameter, with no 'hat brim', so it could fit into a
button that would fit into the lamp socket.

We should find out from one of the 'Semiconductor Antiquities Experts'
when the 1N4002 series of epoxy case rectifiers caame out. My 1969
Motorola manual has them in it, and uses them as a substitute for the
top hat rectifiers. The 1N4002 series must have been out in the mid
'60s or maybe earlier. Someone recently mentioned Poly Paks. Those
surplus sales companies used to sell grab bags full of those old top
hat diodes, probably slightly leaky or lower voltage than usual. Same
with the old TO-5 germanium transistors. Today those guitar FX nuts
would drool over a bag of decent quality Ge transistors. :-P' ' '


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