General > General Technical Chat
HP 521C Electronic Counter 1Hz to 120kHz test teardown 1963
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oz2cpu:
wow this monster contain 44 tubes :-)
all details here
https://youtu.be/0DHNVEqzso4

CaptDon:
That's nothing!!! You should see their units with the mixer front ends going into the hundreds of megahertz. I think some of those had 10 columns.
Some dinosaurs are worth feeding, those old HP units are not.
coromonadalix:
Man thats something i never saw, beautiful to say the least  :-+
jonpaul:
used them in 1967 at  LBL

a walk down memory lane

Jon
Colt45:
I still regret not getting one of these from the same family, when it was available for free



My car was already full of other test equipment, is the only consolation... they are gigantic.
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