[AMPS] 4-400As vs. 3-500Zs

[f117ab@ameritech.net]

1. The extra power is going to turn on (drive) the tubes and being fed through
to the output.
2a. 3-500z is designed for grounded grid operation. 4-400a is not.
Interelectrode spacing, etc.
Gain in grounded cathode operation will be different. Even assuming they were
equals in this respect;
2b. 3-500 = 500W plate dissipation. 4-400a = 400W.
2c. 3-500 = 20W grid dissipation, 4-400 = 10W
Art   k9xf

zeitler@ibm.net wrote:

> I plugged a pair of Eimac 4-400A tubes into my LK-500 today to determine the
> condx of the tubes. With 150 watts in I get 1300 out on 80 meters. Using
> 3-500Zs in the same amp on same freq I get 1600 out with 120 watts of drive.
>
> 1. where is the extra drive power going?
>
> 2. why is the o/p that much less than the triodes?


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