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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>
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