The same socket is used for the 4CX1000A and the 4CX1500B(p/n SK800B). The
4CX1500A uses a different socket(SK831). Increasing the screen voltage does
wonders for output. That is how owners of the 30S1 were able to improve
performance.
Bob
----- Original Message -----
From: "Roger (K8RI)" <sub1@rogerhalstead.com>
To: "Amps" <amps@contesting.com>
Sent: Tuesday, May 20, 2008 6:03 PM
Subject: Re: [Amps] New Amps at Dayton
> Bob Maser wrote:
>> The new Alpha amp that runs a pair of 4CX1000A's is the 8410. This amp
>> uses
>> a 3.6KVA plate transformer.
>>
>
> The same 4CX-1000A used in the 30-S1? The one with zero grid dissipation?
> That's the tube I've always said I'd never use in anything because it's
> so fragile or have I missed something?
>> Also at Dayton Emtron introduced their new DX2B which also uses the
>> 4CX1000A. They are in the process of introducing the DX3B which will run
>> a
>> pair of the same tube. Looks like all the manufacturers of amps are
>> scrambling to replace the Russian tubes. The 4CX1000A can be replaced by
>> the 4CX1500B, which has higher plate dissipation(remember the 30S-1 mod
>> with
>> the high screen voltage?).
>>
> Isn't that quite a project? IIRC the 4CX-1000 uses a bayonet socket
> while the 4CX-1500 uses a more conventional socket.
>
> If the Chinese are building lots of tubes are't they building the 3CX
> and 4CX 800's?
> Maybe I should consider rebuilding my 2002A, but it doesn't have a heavy
> enough PS for the 4CX1500 let alone the screen supply. <:-))
>
> 73
>
> Roger (K8RI)
>> Bob W6TR
>> ----- Original Message -----
>> From: "Dennis W0JX" <w0jx@yahoo.com>
>> To: "Amplifiers" <amps@contesting.com>
>> Sent: Tuesday, May 20, 2008 9:42 AM
>> Subject: Re: [Amps] New Amps at Dayton
>>
>>
>>
>>> The only thing that I saw at Dayton worth noting is a change in the
>>> current Alpha 8100.
>>>
>>> The finals have been replaced with TWO 4CX1000A's instead of the
>>> 4CX800A7's and the amp has been relabeled either an Alpha 8200 0r 8400
>>> (sorry I tossed the literature and can't remember the exact number).
>>>
>>> Anyway, this should be considered a warning to any amp owner who has an
>>> Alpha 91, 99 or 8100, QRO 2500, or ACOM 1000 and 2000A. Alpha said the
>>> supply of GU-74B's is drying up quickly and they made the switch to
>>> ensure
>>> availability.
>>>
>>> Incidentally, the 4CX1000A's used are NOT Eimac but made by Penta in
>>> China.
>>>
>>> 73, Dennis W0JX/8
>>>
>>>
>>> _______________________________________________
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>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>
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>>
>>
>
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