[Amps] Input Impedance of GI-7BT Triode

[Mike Tubby]

The easiest thing to do would be:

a) to guess
b) take it to a friendly RF engineer who has a network analyser



> I have recently completed converting an MLA-2500B to use the GI-7BT
Triodes.
> Thanks to a lot of hand holding by Lawson, W4EMF!
>
> Now, I am building WD7S's great little TU-7B tuned input board to allow
> driving the amp with a modern tranceiver which does not have an
auto-tuner.
>
> I am wondering how to determine the input impedance of these tubes.  Plate
> voltage is around 2300v.  I have the data sheet, but am not seeing any
> reference to the input impedance since this is a tube designed for pulsed
> microwave service.
>
> Any help would be much appreciated!
>
> 73 Kevin K7ZS
> Portland, Oregon
> k7zs at earthlink.net
>
>
>
>
>
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