4CX250B tubes will reliably run 500W out for a pair( observe the AN/URC-32 or
its commercial cousin the KWT-6). If you must have more try three, as I recall,
(AN/ARC-58 or TRC-75). This was 1 KW output autotune on the back of a jeep.
These military radios had to operate under rather stringent (read horrible)
conditions. And guess what....these " relics " did just fine!
Yes there are better tubes available today...but the old 4CX250 family is the
granddaddy of all of them. If you come across a pair, and they should be
inexpensive, there are many good designs which have been published thru the
years.
Frankly, I doubt you could tell the difference between 3 4CX250Bs and an 8877
except for the rattle of the change still in the pocket of the guy with the
4CX250B rig! He can then spend money on an antenna and feed line where it
really counts!
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