[Amps] Input tuning

R; Measures r at somis.org
Sat Apr 29 11:25:58 EDT 2006

On Apr 29, 2006, at 8:04 AM, Jeff Wilaby wrote:

>    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.

Make the reactance of C-in 25-ohms on each band if u want a low swr  

> I have heard of using everything from a 50 ohm swamping
> resistor

For AB1, a grid-swamping R is needed.

> 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
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