!00 watts drive seems to be quite a lot for a single 4-400A G-G amp.
However, in some amplifiers I have noticed that the plate seems to
get hotter with some drive and cooler with even more drive.
This may be due to changes in efficiency as the drive is increased and
the tube is going from class A up toward class B operation.
Good luck.
I like to use the 4-250A instead of the 4-400A because they have the
same electrical characteristics but the 250s glow brighter.
73
Bill wa4lav
At 03:12 AM 11/8/2002 -0800, Bill Smith wrote:
>I have installed a single 4-400A in my Swan Mark 1 for
>testing. I am running it Zero Bias and Grounded
>Grid(it's being used as a triode). It has 2500vdc
>plate voltage and a max of about 400ma with 100 watts
>of drive. I am curious as to others experiences doing
>this with the 4-400A. The plate gets red in SSB and
>CW with 100 watts of drive as I expected it should. I
>back the drive down but even in SSB the plate still
>gets red.
>
>73,
>Bill
>
>Resting current is about 40ma. I tested it with about
>100 watts of drive
>
>=====
>Bill Smith KO4NR
>
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