Re: Vacuum-tube final for QRP transmitters?
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Remember the 12BY7. ?
Heck, remember to look in an old-ish (early 1960s) ARRL Handbook and see what they show in the tube tables in the back.? There are plenty of options.?
A 12V filament is a good fit for most portable power sources ... same with two 6V filaments in series.? You still have the issue of the plate supply, but a chopper or switcher supply is simple enough.? Remember those tube-type CB mobile leen-yah amps with the two big round PNP transistors on the back?
You could even gut a 1940s VHF-lo-band mobile for its vibrator supply and 807s.? I have some of those, I think.
73 Jim N6OTQ
Heathkit used the 6CL6 as a linear driver in the HW101 and
similar SB series line. Mike, KC0Y
On 9/16/23 11:21 AM, ajparent1/kb1gmx
wrote:
Nuvisters are for receiving use and max power would be in the 2-3W
range for the tetrodes.
The triodes do less and must be neutralized or they will oscillate
like most triodes
I happen to have worked with them and as tubes go they wer
excellent to about 700-800mhz
but not so much for RF power.
Most of the tubes that would do any power over about 3W are costly
for power consumed
(heater/Filament and plate).
FY look up the Hallicrafters HT37 phasing transmitter....? big and
heavy and required much
tuning to keep them clean as the tubes drifted with age.? I know,
I have one that I fire up?
from time to time.? There are others of the era.?
--
Allison
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