[Amps] Future availability of 3cx1200a7 and 3cx1500a7

[rlm]

The 3cx1200A7 is supposedly on Eimac's to-be-discontinued list.  Their 
new  3cx1200Z7 is clearly a superior bottle - unless one is trying to 
build a 1500w  VHF oscillator.

On Friday, October 24, 2003, at 01:37  AM, Skram, Helge (MED) wrote:

>
>
> -----Original Message-----
> From: amps-bounces at contesting.com 
> [mailto:amps-bounces at contesting.com]On
> Behalf Of Jeff Maass
> Sent: 23. oktober 2003 16:17
> To: rlm; Ed Briggs; AMPS
> Subject: RE: [Amps] Future availability of 3cx1200a7 and 3cx1500a7
>
>
>
> ...none of which addresses the question asked!
>
> He's **buying** an amp, not building.
>
> He wants to know about the likely continued **availability**
> of the 3CX1200A7, 8877, and 4CX800A, not alternatives that
> may be better designed.
>
> My guess is that when the cockroaches inherit the World,
> they'll nest in the shelves of NOS 4CX800A tubes cranked
> out by Svetlana over the past and future years for the
> Russian military, industrial, and the Amateur market.
> They're very available now, and cheap due to their supply.
>
> The 3CX1200 series is (A7, U7, Z7) are much more limited in
> market, and I'd hope they don't go the way of the 4CX1600B.
> It was also designed primarily for the Amateur market,
> and is now essentially unavailable just 5-10 years later.
> Many unhappy Ten Tec Titan II owners!
>
> There are lots of 8877 out there, by virtue of their long
> production, and their use in commercial/industrial
> applications. At least one other brand than Eimac is
> available (Taylor?). I've heard that Eimac has contracted
> out the production of 8877 to China?
>
>>>> There it is again, the "information" that Eimac has contracted out 
>>>> the
> production of 8877 to China.
> I have an email from marketing director in Eimac that the never ever 
> have
> produced any 8877 in China and there is no plans to do so either.
>
> The history behind this started when a local Svetlana distributor 
> claimed
> that Eimac had stopped production of all the small tubes, that is the
> typical tubes for radio amateurs. He could also sell me 8877 produced 
> on
> licence from Eimac in China. The 8877 was no longer produced by Eimac 
> in
> USA.I was not shure this was correct, so I contacted Eimac. They could 
> tell
> a different story and was quite upset by the "information" I had 
> received.
> All the tubes in the Eimac website are in production, including 8877.
>
>
> 73 de LA6MV
> Helge                >>>>>>>>>>>><
>
>
>
> 73,
>
>   Jeff Maass  K8ND
>
>   Caribbean Contesting Consortium - PJ2T
>         http://www.pj2t.org
> http://home.columbus.rr.com/jmaass/Radio/PJ2T_Aerial.htm
>
>
>> -----Original Message-----
>> From: amps-bounces at contesting.com 
>> [mailto:amps-bounces at contesting.com]On
>> Behalf Of rlm
>> Sent: Wednesday, October 22, 2003 10:08 AM
>> To: Ed Briggs; AMPS
>> Subject: Re: [Amps] Future availability of 3cx1200a7 and 3cx1500a7
>>
>>
>> ****  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/
>>
>> _______________________________________________
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>>
>
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Rich Measures, AG6K, 805.386.3734.  www.somis.org/