On Monday, November 3, 2003, at 04:51 PM, Pat Barthelow wrote:
rlm Said:
*** The problem is not with the 811A grids, it's melting holes in
the 811A plates/anodes due to the increased velocity of electrons
because Collins Radio used more than the rated anode V.
There's a great picture of a pair of 4-400As producing lots of power
(modulators) at:
http://hawkins.pair.com/atcitynj/atcity14b.jpg
Can you guys give an opinion as to whether these 4-400As or other
tubes with this plate color are within their long life operating > range?
*** 4-400As/4-250As/3-500Zs and the like show color because such tubes
cool themselves mainly by radiation.
...
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