[Amps] W6PO 2m amplifier - input circuit adjustment

[David G4FTC]

Searching the amps archives, I know this question has been asked before 
but........

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.

Regards

David G4FTC