>
>measures wrote:
>
>> >If the tube has enough voltage breakdown to handle the
>> >fundamental RF voltage without problem, we can be sure it will
>> >handle almost any spurious oscillation.
>
>> Surely. The arc that makes the big bang is apparently from B+ to ground.
>
>The component in the B+ chain that arcs is thus the (RF choke?).....?
Probably not. The choke is too well insulated from gnd.
>The destruction can be avoided by fusing the B+ chain with a fast blow
>fuse?
Fuses do not act to limit peak current, and that is the destructor.
>Are we sure that these arcs are not simply filth on high voltage
>components, and/or over-heated ditto, which then creates a gas plasma
>path to ground, with the subsequent accusation of parastitic
>oscillation?
Dust would not be able to cause a large increase in R-supp.
> If the blocking cap shorts to ground, the HT on the anode
>shares it's path to ground through the suppressor components, which
>could explain scorched resistors.. Remember there is DC on AC in this
>case, so the path might not be totally through the obvious inductance
>route only.
I have never heard a report of such a thing.
>
>Have we also established that Joe Ham didn't tweak the bandswitch
>instead of the tuning cap while eyes glued to the PEP meter and hearing
>that rare one get away? Joe wouldn't admit this in a 1000 yrs would he,
>specially if the box was under warranty? (I have occasionally wondered
>why the "tuning cap" seems a bit stiff on my green monster, only to
>discover, timeously, why!).
>
cheers, Ian
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