> The 4CX250 family is another very poor choice. They were not developed for
> SSB use and the linearity is only in the mid 20's under the best of
> conditions. This includes the 250R. Ian, G3SEK/GM3SEK, has written
> extensively on that subject and even developed a set of bias regulators to
> at least improve the IMD a bit.
I think they can do better linearity than that - the amps I built have
all done so at 250-300W/tube. The STC data sheet for 4CX250B gives IMD
figures under the typical operating conditions. At 2kV, 325W pep output
they give IMD3 -30dBc and IMD5 -50dBc. That's in line with what I've seen.
Steve
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