Bill said: (re 6AG7)
> It was originally designed as a resistance-coupled amplifier for video output
> circuits
in the early black and white TV sets<
I think it was out shortly before the end of WW2 as a video amp/driver for
radar purposes - a very similar application. Its little brother is the 6AC7.
Funnily enough, I've never had parasitic problems with the 6AG7, although I've
always used a 47 ohm grid stopper and 68 ohm screen stopper, with no shunt
coils.
Thinking back, I can't remember any 813 PAs that had parasitic suppressors,
although that doesn't mean that they may not have needed them! This includes a
number of commercial (as opposed to intended for amateurs) HF tx's.
73
Peter G3RZP
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