[Amps] 144 MHz GS35B input circuit

[N1BUG]

Just looking for a reality check here. I am trying to get an amp 
running. It was not built by me and had apparently been sitting for 
quite a while.

Everything seemed to be working but the input SWR wouldn't tune 
below 4:1 with about 25W drive. I understand it will change some at 
full power but I don't think this circuit is working as desired and 
am reluctant to put my SS driver PA into it.

I pulled the bottom cover to look at the input circuit. It's the 
usual T with two coils (not the usual dimensions) and shunt 
capacitor between them. BUT, it is connected to the bottom 
connection of the tube. I think that is the filament connection that 
is NOT common to the cathode. There is NOT a capacitor across the 
two filament/cathode connections. All of the circuits I could find 
online this afternoon show the RF input to the next ring up on the 
tube (filament/cathode common). Some show a capacitor across the 
filament connections, some don't. Comments?

I am inclined to rip this out and rebuild. The 10 AWG hard silver 
plated wire the coils are made from makes it impossible to spread or 
compress turns to experiment with the match.

Thanks,
Paul



-- 
Paul
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