[Amps] 4cx800a
Carl
km1h at jeremy.mv.com
Wed Feb 17 05:17:36 PST 2010
Kees, sice remarking, rebranding, and other less than ethical methods have been used almost since the beginning of the vacuum tube era Im naturally suspicious by nature.
And from what I know of the Svetlana operation, many phone conversations with George Badger when I sold Svetlana tubes, and other sources in Russia, Ukraine, and Bulgaria, Ive no doubt that the 4CX800A followed those above methods. And continues to do so with the full knowledge of the very few companies still using them.
Carl
KM1H
----- Original Message -----
From: Kees - pa7two
To: km1h at jeremy.mv.com ; AMP reflector ADD MESSAGE
Sent: Wednesday, February 17, 2010 12:27 AM
Subject: RE: [Amps] 4cx800a
Hi Carl,
In that case I cannot help you I guess. I do not have connections directly to the plant, only to a tube seller.
If the data printed on new carton boxes and the year / month on new tubes and on accompanied certificates are not good enough for you to judge that these tubes are still produced, a well... That is your call :-)
Vy 73, de Kees.
> From: km1h at jeremy.mv.com
> To: pa7two at hotmail.com; amps at contesting.com
> Subject: Re: [Amps] 4cx800a
> Date: Tue, 16 Feb 2010 15:57:24 -0500
>
> What I really want is published data that says the tubes are in current
> production.
>
> Whats on the tube or a box is meaningless.
>
> Carl
>
>
> ----- Original Message -----
> From: "Kees - pa7two" <pa7two at hotmail.com>
> To: "AMP reflector ADD MESSAGE" <amps at contesting.com>
> Sent: Tuesday, February 16, 2010 3:03 PM
> Subject: Re: [Amps] 4cx800a
>
>
>
> 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 at jeremy.mv.com
> > To: pa7two at hotmail.com; amps at 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 at hotmail.com>
> > To: "AMP reflector ADD MESSAGE" <amps at 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 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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