On 2022-03-07 8:23 a.m., 'John Rehwinkel' via neonixie-l wrote:
What's even more interesting is that a lot of these old dinosaurs
still work. A friend at work gave me a US Navy scope (USM-117) from
the early 1960's, and at first it was having some problems generating
high-enough anode voltage for the CRT, but letting it run a few hours
apparently coaxed the capacitors into working again. The other neat
thing about this scope is that the only vacuum tube is the CRT;
everything else is transistors which was quite a feat for 1963.
I picked up this USM-117 at a hamfest for a few bucks in "you fix"
state. It turned out to be pretty dirty and beat up, a few bad
transistors, and the base had come off the CRT. I had never reattached
a CRT base before, but I figured I had little to lose. I ended up
curing the base cement in the kitchen oven. It worked, too!
Beautiful! What are you using to generate this image?
Thanks
--Toby
- John
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