> Is there some reason why there seems to be very few HF amps built
> the 4cx250b's? They seem to be cheep and very plentiful.
> I am thinking of building an HF amp using 3 or 4 4cx250b's. Is there
> anything wrong with doing this?
nothing wrong with that, plenty of amplifiers with those tubes have
been built and used commercially in Europe
Example RFT with the KN1E with 4 parallel tubes and one as driver.
I built one with 3 tubes 30 years ago, it put out clean 1100W
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