In the mid 80's the use of the 3CPX1500A7 in linear amplifier service was
investigated
in connection of "re-tubing" a commercial MF/HF amplifier.
The outcome was that it would have permitted higher peak power and power gain
due to a about 30% higher DC plate voltage rating, and the sturdier cathode
with more peak emission, as compared to the 8877.
However, due to the higher tube cost this route was abandoned in favor of
paralleling two "cheaper" tubes and lowering the plate voltage.
This was in the "pre Russian tube" era, otherwise one or more GS35's or GU84's
probably
would have been used.
73/
Karl-Arne
SM0AOM
----- Original Message -----
From: "Steve Thompson" <g8gsq@eltac.co.uk>
To: <amps@contesting.com>
Sent: Saturday, October 21, 2006 8:31 AM
Subject: Re: [Amps] 3CPX vs 3CX tubes
>
>
> Gudguyham@aol.com wrote:
> > Hi, Does anyone know with any certainty the difference between a 3CPX and a
> >
> > 3CX tube? Checking the Eimac data in reference to a 3CPX800A7 vs a
> > 3CX800A7
> > it shows that a 3CX800A7 and a 3CPX800A7 both can be used in linear
> > operation. As far as the 3CPX1500A7 vs the 3CX1500A7 it does NOT show
> > usage of the
> > 3CPX in linear operation, therefore, could the 3CPX1500A7 be substituted
> > into
> > an AL-1500 or similar amp without any caveats?
>
> We ran a 3CPX1500 in a 2m contest station for 15 years or so - it gave
> excellent linearity.
>
> Steve
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