Hi Carl,
What exactly are you interested in? Packaging that
clearly state the production date, tubes that have the dates printed? I
can send you a photo of this to your email if you want?
Let me know, as I have these tubes currently on stock so I can easily shoot
some photos now.
Vy 73, de Kees.
> From: km1h@jeremy.mv.com
> To: pa7two@hotmail.com; amps@contesting.com
> Subject: Re: [Amps] 4cx800a
> Date: Tue, 16 Feb 2010 10:38:14 -0500
>
> All the 800's Ive seen had rebranded codes on them Kees, but this was mostly
> 10+ years ago.
>
> See what you can find out over there but I havent heard anything confirmed
> about new production.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Kees - pa7two" <pa7two@hotmail.com>
> To: "AMP reflector ADD MESSAGE" <amps@contesting.com>
> Sent: Tuesday, February 16, 2010 10:26 AM
> Subject: Re: [Amps] 4cx800a
>
>
> >
> > 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@jeremy.mv.com
> >> To: W4EF@dellroy.com; amps@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@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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> >>
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