There is no 4CX800A except on paper and a repaint job.
ALL came from the Russian factory as GU-74B's.
The 4CX800A designator has nothing to do with standards other than it copies
Eimacs internal numbering scheme.
In the real world US standard it would have a 4 digit ID such as 8877, or
8166 if it was a 4-1000A, etc, etc..
Carl
KM1H
----- Original Message -----
From: "Michael Tope" <W4EF@dellroy.com>
To: <amps@contesting.com>
Sent: Tuesday, February 16, 2010 12:00 AM
Subject: Re: [Amps] 4cx800a
> Thanks to everyone for the feedback on Dr. Alex UR4LL. From all accounts
> he is a very good person to deal with.
>
> That brings me to my next question. Is the GU74B truly pin-for-pin
> compatible with the 4CX800A? IOW, can I plug two GU74Bs into my Alpha
> 91B and expect the same kind of performance that I get with the 4CX800As
> that are in there now?
>
> Thanks,
>
> Mike W4EF.................................
>
> On 2/15/2010 6:13 PM, Michael Tope wrote:
>> Is there a reliable supplier of NOS GU74B/4CX800A's? I have an Alpha 91B
>> and was thinking that I should pick-up some spare tubes for it before
>> the NOS pool dries up completely. I see that UR4LL is advertising them
>> for $100 each. That seems too good to be true. Is he legit?
>>
>> BTW, I agree that the 4CX800A isn't a terribly clean tube for SSB
>> service. All the commercially available amps I've seen with this tube
>> (including the Alpha91B) have mediocre IMD specs.
>>
>> Thanks,
>>
>> Mike W4EF...................
>>
>
>
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