[Amps] Soft Tubes?

[Michael Tope]

Good point, Gerald. A more likely explanation for the low efficiency
on 10 meters might be a combination of higher tank circuit losses
and wattmeter calibration error.

Still, I hear people talking about "soft" tubes a lot. I can understand
broadcast pulls have low filament emission, but aside from that
are there any other mechanisms which will result in diminished
output capacity from a tube like the 8874?

Mike,
W4EF........................................................................
.

----- Original Message -----
From: <TexasRF at aol.com>
>
>
>
> And this brings up the question: Why would a soft tube show up on 10m
> operation and not lower frequencies?
>
> 73,
> k5gw