You may be thinking of the 6293 which is a special version of the 6146 that was
made for pulse modulator service. The 6293 can take up to 3000 volts on the
plate.
Also, the 6293 is an excellent replacement for the 6146 and 6146A/8298 and will
generally last between 5 times and 10 times longer than the 6146 and 6146A/8298
when run using the same parameters. The prices for the 6293 are usually about
the same as for the 6146 and 6146A/8298 from the various tube "sellers" on the
Internet.
Also, the 6146 and 6146A/8298 are rated at 600 volts maximum when used in plate
modulated AM service.
The 6146B/8298A is really a different tube from the 6146 and 6146A/8298. The
6146B/8298A is rated at 120 watts input for Class C in CW and FM service, at
120 watts input for AB-1 and AB-2 (for SSB service), and at 90 watts input for
Class C plate modulated service.
Glen, K9STH
Website: http://k9sth.com
--- On Thu, 8/6/09, Manfred Mornhinweg <manfred@ludens.cl> wrote:
Not so...! I just checked datasheets for the 6146 (no suffix), for the> 6146A
and the 6146B, from RCA and GE. They all agree on the plate voltages: 600V in
CCS, and 750V in ICAS!
The 400V rating in the RCA 6146 datasheet is only valid for a special
situation: Audio amplifiers which have the screen grid directly connected to
the plate!
But now it's time for me to admit a mistake too: Somehow I was thinking that
the 6146 series was rated for up to a kilovolt on the plate. That might be
because in my young hotgun years I used to run them that way. With good
cooling, and watching the plates, I got 160 to 180W PEP clean output in SSB
from a pair of 6146B, ran from a power supply that gave 950V at no load, and of
course dropped some at full load. The tubes are still good today! That speaks
of their quality. I didn't use a speech processor, though. Using one might have
melted the tubes!
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