That less output is caused by the load line used with Eimacs specification
which is more A then AB1 resulting in lower efficiency and lower
intermodulation distortion.
The 4CX1500B however can be driven harder then the 4CX1000A as grid
dissipation is one watt compared to zero on the latter.
Both tubes are good for a clean 1.8KW output.
73
Peter, DJ7WW
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Val
Subject: Re: [Amps] 4CX1500B's -- worth using?
David is right. 4CX1500B seems to be just 4CX1000A with declared 500W extra
dissipation at the expense of the air flow. The grid and screen however are
same - very fragile. That's why it can't produce more output.
But the puzzle is why Eimac specifies it with even less output power than
4CX1000A?
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