Are there any published designed for 2m linears using the 4CX1000A tube? I
tried
to build an amp with a pair of them in push-pull grounded screen, but it never
worked well. Now thinking about something more modest - a single tube, using a
conventional socket with cathode grounded.
I know there was a design in the ARRL handbook for a single-tube grounded
screen
amp, which gave me the idea of a push-pull amp, but I never got it working very
well (it was drawing positive grid current with an output of only 300 W. Had I
pushed the input power, it would have probably damaged the tubes).
I've seen comments that the grounded screen amp in the ARRL handbook was not
such a good idea, which is making me think it might be better to go along the
route suggested in the data sheet. i.e.
cathode at DC ground
grid at -60 V
screen at +325 V
I've also seen a design on the web which ties the screen and grid together, to
use the tube as a triode, but again I want to avoid that.
Are there any decent designs for a 2m amp with a conventional usage of voltages?
I recall John Nelson, GW4FRX telling me the 4CX1000A presents more problems to
hams than any other tube, so I don't think it's the best device ever made, but
I
happen to have quite a few sitting around collecting dust.
Does anyone have a socket for one? I built the grounded screen sockets myself
(had access to a workshop at the time). But I want to buy an Eimac socket, with
the screen decoupling capacitor for this.
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|