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...

indago wrote:
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...

The heatsink is "live" for that style rectifier. It has to be tightened
onto the rectifier (sandwitched) using several bolts. There's acually a
compression rating - if a certain static force is not present during
operation, it will explode...

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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Watson A.Name - Watt Sun wrote:

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.

And some of them use water-cooled aluminum "cold plates", rather than fans.

Bob Weiss N2IXK