Gary,
What you say about the RF choke reducing arcing is correct, but this
is just one of its several functions.
Your point about C1 arcing is a valid point. But, what if, as you
say, it was set near minimum capacitance, and does not arc? When my problem
happened, I was operating on 20 meters. I found no evidence of C1 arcing,
just a fried (actually melted down) RF choke and an arced TR relay. At any
rate, the damage was substantial to the front end of my FT-1000D.
The RF choke may be only rated at 125 Ma for continual use, but
what happens, instantaneously, during a "Big Bang?" I have no way of
measuring the peak current, but think it is safe to say that it would be
several amps, often resulting in vaporizing the choke. I see this quite
often with the grid chokes. They are the same chokes as used across the
output. Of course, they are subjected to a very different current flow than
the output choke, even in a "Big Bang."
73 de Lon, K5JV
1110 Golden Bear Ln.
Kingwood, TX 77339
281-358-4207
281-358-4234 FAX
281-795-1335 CELL
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