**** The problem with the 3cx1200A7 (and the 3-1000Z) is that it has
roughly 7x as much feedback-C (Anode-cathode C) as an 8877. Although
more feedback-C is beneficial in VHF oscillators, it can be a problem
in HF amplifier applications. To reduce feedback-C, Eimac came up with
the 3cx1200Z7. It has about 1/10 as much feedback C as the ...A7. The
cost is c. $20 more than an ...A7, it uses a 6,3v filament, and it
requires a better-design socket, so it is not a plug&play substitute..
cheers
On Tuesday, October 21, 2003, at 06:09 AM, Ed Briggs wrote:
I was wondering if it is possible to predict how long the 3cx1200a7
will continue to be available from Eimac. I'm considering buying a new
amp, and pondering the future availability of the 3cx1200a7,
3cx1500a7, and of course the Svetlana 4cx800.
Is the 3cx1200 widely used? I know of two amateur amps in production
with this tube, and I wonder if there are non-amateur applications.
It seems the 3cx1500a7 is more widely used in non-amateur applications
and thus might be a longer survivor. Also, it seems to have a second
source.
Anyway, if anyone has guidance, particularly wrt. the 3cx1200, I'd be
very grateful indeed.
Ed
N1TS
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Rich Measures, AG6K, 805.386.3734. www.somis.org/
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