I've just fired up a Dentron Clipperton V modified for 6M operation per
Dentron instructions. It uses a single 4CX250B in Class AB2. The bias is
adjustable, and the factory recommends 50mA plate current with no signal. It
takes about 15W to give me 250W-300W out.
My question is about power ratings. I want to use it on both CW and SSB. How
hard can I push it without damaging the tube on SSB? The DC current rating is
250mA. In SSB mode, I can get 200W indicated on a Bird with an indicated
plate current of 200 mA or so (this is with modulation, not tune-up). I'm
tuning up with high speed dits, so that I should be tuning for that peak
power. Is this a reasonable way to run it, or am I pushing too hard?
When I run CW,can I increase the envelope power on CW if I stay below 250mA
average current (as indicated on the plate meter), or do I need to stay below
250mA when I tune key-down? Can I change the bias to get more than 250W
out, or do I need to make other changes to the circuit to change the load Z?
73,
Jim K9YC
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