Tokyo High Power did it for decades with a pair of 4CX150A/4CX250B and
stable as a rock on all bands.
As with many amps a homebrew version may not have the best layout and
construction practices and the blame is put on the circuit instead!
Following an old W6SAI article in CQ I built one with a 4-1000A in the 70's
and it was fine thru 10M using a B$W output network.
Carl
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "Amplifier Reflector" <amps@contesting.com>
Sent: Friday, October 19, 2018 3:06 AM
Subject: [Amps] Super Cathode Driven Tetrodes
Someone had posted that Super Cathode Driven amplifiers are unstable.
Can someone elaborate on that notion?
It does not make since due to lower gain and that screen grid is directly
connected to ground.
I hope in the future to do some experimentation on this design. Goal is
one 4CX300Y driving 3ea
for legal limit. Neat thing is that just about all the tx, driver power
finds its way to the output.
This tube has 400Watts plate dissipation.
73
Bill wa4lav
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