813 drive question
Hi James,
You want the honest answer, it's not really that close, but
it will work ok. Your probably going to be cooking the 813's
into AB2 operation to get enough gas out of them. It would
be more practical to set up a quad version. I have a quad
setup with just under 4KV on the anodes, some kind of
wonderful.
There are some old timer tricks of swamping the drive with
a resistor of various values. For AB2 operation, that's much
wasted power in my book. Pi or LC circuits are the way to
go if you can manage.
cheers
skipp
[snip]
From: "james fisher" <k4gf@worldnet.att.net>
Is the input impedance of a pair of 813 tubes, grounded grid
configuration,
close enough to the magic 50 ohms to accept power from a modern exciter
with
simply a parallel low-Q circuit shunted from input to ground? I sure
hope I
do not have to work up a pi-network for each of three bands. Thank you,
73,
J. Fisher K4GF
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