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[Amps] W6PO 2m amplifier - input circuit adjustment

Subject: [Amps] W6PO 2m amplifier - input circuit adjustment
From: "David G4FTC" <>
Date: Fri, 09 Jun 2006 17:28:16 +0000
List-post: <>
Searching the amps archives, I know this question has been asked before 

Apart from squeezing/expanding the coils of the input T network to obtain a 
satsifactory match, has anyone tried using a PI-L or similar network to 
simply the input tuning?

The original W6PO design made one of the L in the T network variable to 
simplifiy obtaining a match - but the chances of getting a suitable 
ajustable core are probably nil, so adding a second variable C into the 
network would seem to be a logical move.

Before I take an electric drill to the chassis to mount another C, does any 
one have any thoughts why this may not work?

What worries me a little is that most tube VHF amplifiers use the same basic 
T network for the input, and no-one seems to have considered that the T 
needs to be improved.


David G4FTC

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