Stated:
"I'm building an amp using a pair of 4-400's in a grounded grid
configuration. I was wondering about the input tuning and what the best
way
of approaching it. I have heard of using everything from a 50 ohm
swamping
resistor to an internal auto tuner. As this amp is in the planning
stage, I
thought I'd post the question to the reflector."
The "standard thing' here is to use a pi-net mounted physically close to
the filaments. As stated by another, an operating Q of about 3 is ideal.
Some band switch pre-tuned, fixed pi-nets in and out using small relays.
Good luck, Roy K6XK
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