[Amps] 4cx800a

[Kees - pa7two]

Hi Carl,

I have certainly seen Svetlana production 2007 / 2008 (as I recall) labled with "4CX800a". I do recall seeing this label on a few websites too.

Furthermore are the GU74B tubes still recently produced at the Svetlana factory. I assisted HAMs obtaining these young age tubes when needed as a spare, and I furthermore I have at current a few spares GU74Bs from year 2007 and 2008 in my shack / at stock.


Vy 73, de Kees. 

Member of an all HAM family. 

AmateurRadio : PA7TWO - M5TWO Locator: JO22jp. 









> From: km1h at jeremy.mv.com
> To: W4EF at dellroy.com; amps at contesting.com
> Date: Tue, 16 Feb 2010 10:05:18 -0500
> Subject: Re: [Amps] 4cx800a
> 
> 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 at dellroy.com>
> To: <amps at 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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> 
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