[Amps] Input tuning, 3-500z

[Jim Valdes]

I'm working on an older Henry 2K-3 (2 x 3-500z) amplifier. On a few 
bands the best SWR I can achieve on the input side is above 2:1. In the 
days of tube finals this was fine for the exciter however the solid 
state transceivers don't like this.  I understand how to tune the output 
with no power applied to the amplifier, can the input be tuned in a 
similar fashion? How do you determine the input impedance? What is the 
correct procedure? I've located a couple of schematics for other 3-500z 
amplifiers, but the input circuits vary significantly. The Henry used an 
L on 10m and Pi networks on the other bands with tunable inductors.
Any suggestions?

Jim, WA1GPO

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James R. Valdes, Senior Engineer
Woods Hole Oceanographic Institution
Tel. 508-289-2263
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