[Amps] Dual GS35b input impedance

[Tomm Aldridge <KD7QAE@ARRL.NET>]

I am now at the stage of designing my tuned input for the dual GS35b amp 
that is in process here.  There seems to be a general concensus that the 
tube presents a 50 Ohm impedance when cathode driven in GG 
configuration.  Can I assume a 25 Ohm input impedance as a good starting 
point for my input filter design?

Regards

KD7QAE
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