[Amps] Input tuning

[Jeff Wilaby]

   Hi everybody,

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.

Thanks and 73s in advance, Jeff   KA0ZYD