Bob said:
"In your situation however my guess is the amplifier is not your problem but
your exciter. (As I assume you haven't modified your AL-1200 for plate
modulation.) You are clipping in the exciter when trying to drive your amp
to higher power."
*******In the case of my AL-1200, I drive it with a Viking II. My viking II
is capable of 100% modulation at the 100 watt carrier level. I have
modified my Viking II to produce variable power and when the carrier power
out is around 20 watts of 100% plate modulation, I look at both outputs
(Viking II and AL-1200) and the pattern with sign wave modulation is pure.
When I increase the 100% modulated Viking II and the amp carrier output goes
above 380 watts, the modulation peaks start to flattop. So in this case the
exciter is not clipping.
Bob said:
"In Class A to answer your question, you would need to dissipate every bit
of the PEP power level you are looking to put out in resting condition."
*******Do I understand that in my original example (375 watt carrier, 1500
watt pep) a tube in class "A" would only require a plate dissipation of 1500
watts? Implied in your answer is the thought that a 1500 watt PEP sideband
signal would have the same class "A" dissipation requirement as a 1500 watt
AM signal. Help me out here.
73,
Ken W2DTC
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