I wonder what Tentec has to say about this. I'd suspect that it is a
warranty issue vs price issue between the Eimac product and the user.
As I recall Eimac limits its warranty to the purchaser and does not have
a pass-through warranty to the end user.
73
Bob K4TAX
Lane Zeitler wrote:
>
> Gents,
> I rcv'd this today from the amps reflector. Interesting to note that this
> does not jive with what several folks have stated T-T reported.
>
> Lane
> Ku7i
> ----- Original Message -----
> From: Tom Hix W4TH <w4th@webtv.net>
> To: <amps@contesting.com>
> Sent: Monday, August 14, 2000 9:26 PM
> Subject: [AMPS] 3cx800a7 response from Eimac
>
> >
> > There has been some talk on the reflector lately about Eimac having
> > stopped production of the 3cx800a7 tube, and having replaced the tube
> > with the 3cpx800a7. I wrote to Eimac, and here is the reply I received.
> > 73
> > Tom
> > W4TH
> > +++++++++++++++++++++++++++++++Tom,
> > Your inquiry has been forwarded to me, and we do appreciate the
> > opportunity to answer your questions directly.
> > The 3CX800A7 is still in production and will continue to be. As with any
> > tube from any manufacturer, there are occasional variations which result
> > in "super tubes", but all the tubes we ship meet spec or they don't go
> > out. We do sometimes have products returned due to failure under
> > warranty, and we cover these. Although our failure rate is low, I am
> > sure that it seems high to the individual who has had a failure in the
> > only one he has received. Some equipment may have been set up so that it
> > only works with super tubes, and then when more standard tubes are
> > received there are problems. While it would be nice if Eimac produced
> > only super tubes, that is unfortunately not always possible.
> > The 3CPX800A7 is a drop-in substitute for the 3CX800A7, both
> > mechanically and from a tuning standpoint. It has a slightly longer
> > ceramic and will hold off higher plate voltages, but it is otherwise the
> > same. We have found that in FM transmitters operating in class AB, the
> > plate voltage can be raised to 3.2kV, which provides a slight gain
> > improvement and makes the tube easier to drive. This seems to be
> > effective in those applications where the equipment was designed around
> > really hot tubes, and it is also effective in providing additional
> > margin for equipment operating in parts of the world where the line
> > voltage sags significantly. For these reasons, Eimac now recommends the
> > 3CPX800A7 for FM transmitters putting out more than 800W.
> > Both the 3CX800A7 and the 3CPX800A7 are in production, and are available
> > from stock at Richardson Electronics.
> > I hope this covers your questions.
> > Best regards,
> > John Allan
> > Vice President of Marketing
> > CPI / Eimac
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