In article ,
mentioned...
030904 1736 - Lizard Blizzard wrote:

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


Imagine the size of the heatsink for that...

Things with big SCRs, like motor controllers, don't have a heatsink as
you would think of it. They use a square tube with fins pointing into
the cavity, and fans on the end.


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