I have a few questions about this idea:
What would be needed to convert a "traditional" linear
(AL-1200, AL-1500, L-4B, TL-922, etc) to strictly Class C
operation?>>
Too much work.
Is there a specific tube (or tube series) that would be more
efficient when run in this class?>>
Yes, a low mu grid driven triode with very high peak
emission current.
You want a tube that can produce very high current pulses
(very low anode to cathode "on" resistance) without damaging
the tube. You want a switch, not a linear tube.
What efficiency could be expected?>>
If you play your cards right, about 90% or more. The
theoretical limit is right at 100%. RCA made a BC
transmitter that ran in the lower 90% range. It was a low mu
triode with third harmonic resonators in the anode and grid.
We had one at WSPD that had a very slight metering error in
three of the meters, and it calculated to be 102%
efficiency. :-)
Class AB at the edge of B can be over 70% in theory. As I
recall about 75%.
Does Class C provide more/less gain (drive power) to obtain
1500 Watts output?>>
Generally speaking less gain.
Don't try to run CW through it though!
73 Tom
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