[Amps] Push pull amps

Tom Osborne Sr. w7why1 at gmail.com
Sat Aug 1 13:02:17 EDT 2020

I recently purchased some QST's from '47, 49, and 50.  I notice a lot of
transmitters and amps back then used 2 tubes in push-pull circuits, instead
of parallel, like we mostly do now.

What was the idea behind push pull compared to parallel, and when did the
change take place?  Thanks and 73

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