As I muddle through the understanding of amp design, there is a remaining topic
that is confusing me - in regard to matching drive power to the exciter (in
this case a modern 100w transceiver).
I understand that my 100-w tranceiver should be run at maximum output to the
amp input. Apparently, this requires a grounded-grid setup to accomodate the
relatively high drive level. Yet there seems to be many amps that are
grid-driven that require very small amounts of drive power. Are these amps not
designed to be used modern transceivers? Are they commonly driven by homebrew
low-power exciters?
In my case I am trying to design a g-g 813 amp. The only g-g information I
have found is in the Orr handbook which says 25w drive - which I asume is pert
tube. Do I next assume that I need 4 813's match my transceivers 100w max
ouput level? With what have folks been driving all those homebrew 2x813 amps
over the years?
I've been told I'm wasting a good pentode by using it in grounded-grid. Yet
the 813 specs say something like 0.2 watts of grid-drive power, which is
obviously (?) not meant for modern transceivers.
Steve, KK7UV
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