[AMPS] '250 anode-screen

[John Nelson]

Message text written by "Steve Thompson"

>For interest, I ran hipot on half a dozen used examples. Leakage started
at voltages between 5 and 12kV, but I didn't get any external arcs.<

Interesting. Many years ago I often used to see '250Bs removed from a
Marconi NT204 distributed amplifier as part of routine maintenance. These
always appeared to have been grossly overheated insofar as they were
extremely blackened and contaminated with what looked almost like soot. The
maintenance staff seemed quite happy to run them in this state, however,
and thought nothing of the occasional flashover! I wonder what the
anode-screen leakage was like. 

73 John
GW4FRX

















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