>!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.
>
** Indeed, and it produces the same peak-emission as a 3-400, 3-500 and
4-400. Another good light show can be produced by the 8281/4cx15,000A.
When a clear plastic chimney is used, electrons striking the alumina
anode insulator below the anode-cooler, cause it to glow blue.
cheers, Bill\
>
>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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>
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- Rich..., 805.386.3734, www.vcnet.com/measures.
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