[Amps] 4-400G

[John T. M. Lyles]

I saw a RCA 1 kW broadcast TX last week that was running new Amperex 
4-400's that were graphite plate, without the fins that are on the 
Eimac/Triton style (that look like 3-500Z plates). The plates were 
smooth cans, and they were glowing cherry red in the modulator. They 
were made by the Covimag factory in France, which Richardson gets 
their 'amperex' tubes from. Anyone have any 3-500 experience with 
tubes having this sort of plates in them?

John
K5PRO
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