[Amps] Future availability of 3cx1200a7 and 3cx1500a7

[rlm]

****  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
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
Rich Measures, AG6K, 805.386.3734.  www.somis.org/