There are NO 12V final amateur transceivers that make -40dB IM3, none. Never
have been, never will be. The best are at -33 to -35.
Those transceivers capable of 200 Watts are all usinng 28 or 50V finals and can
reach -40 depending on the low pass filter used behind the PA.It's time for the
manu's to get rid of this fascination with running evberything off a battery.
The most expensive part of any SS amp is NOT the finals themselves it's the LPF
that will take 1500 watts and keep harmonics leagl (-43db HF, -60dB 6m). That's
not IM3. Name the amp that hits an IM3 of -40. The 8877 will come close, the
Russian triodes won't, none of the tetrodes will do it.
--
R. Kevin Stover
AC0H
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