[Qcwa] does anyone know how?

Sat, 17 Aug 2002 13:34:41 -0400

On Fri, 16 Aug 2002 15:14:09 -1000 (HST) Joseph Fenn <[email protected]>
writes:
> This is a tikler to generate conersation!
> 
> Does anyone in this illustrious group know how that
> type of amplifier got its name "push-pull"?
> 
> Or for that matter  a PUSH-PULL Xtal oscillator?
> 
> Is it pushing or pulling and if its doing both is it doing it
> simultaneously?
>                  Joe (aka kilroy) KH6JF
> 
>SURE,  JOE!  The first push-pull amps consisted of 
two tubes,  side-by-side.  When viewed together,  
along with their tube pins slightly exposed in their tube
sockets,  they looked somewhat like an elephant 
(of sorts).  The confusion as to which end of the
elephant is the tail and which is the head,  led many
to call this animal a "floppy-eared pushme-pullme."
And since both the front and back end of an elephant 
operate simultaneously,  you can see where the idea
of a large,  elephant-sized amp with parasitic suppressor 
"ears" took on the name of a push-pull power device.
Always look to your forebears for answers to these 
technical questions, Joe -- that way you save bandwidth.
                        --  Alan,  KJ9N
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