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.
Amps mailing list