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Armstrong FM tube transmitter efficiency

I had typed a good reply to this thread and it got completley wiped out.
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Sounds normal for RI.

Anywho, to futher derail this, code may require some of those. Others may be just a handy place to get power w/out running a whole new conduit.

Here's an example of weirdness. 15 amp 120 V block heater on a 20 amp breaker in a 120/240 V single-phase sub-panel with 100 breaker. That's fed by a 480 to 240 V 15 kVa stepdown transformer. Primary is fused by a pair of 60 amp Time Delay fuses. Guess what blew when the block heater ground-faulted?
 
My money's on the 60 amp fuses.
 
Yep!

As far as effeciency, is it looking into a good load? Sometimes that reflected indication is not real.
A Harris FM20H3 went for years just making power with lower than normal effeciency. Happened to be up there when the antenna was all iced up. Other FM's were VSWR'd back but this thing was making all sorts of power and really happy! VSWR was only slightly lower than "nornal".
Ah HA!
Too late to sweep the antenna since the whole thing was dismantled when a new site replaced it shortly after that observation.
 
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