> >> Tom, please explain in your view, why tube type amplifiers are fitted
> >> with suppressors. And when amps with 3-500z's (for example) go band,
> >> why do they go bang?
> >>
> >> Ian, ZS6BTE
> >
> >Tubes flash over because something either exceeds the normal
> >breakdown voltage, or because something inside the tube lowers
> >the breakdown voltage.
>
> Ian asked about a bang. External arcs can make a loud bang. In a
> vacuum, arcs do not bang.
Arcs inside the tube do make a large bang if the amplifier does not
have enough ESR in the anode system.
Everything evil in the world, as disappointing as this may be to you,
is not a parasitic. As a matter of fact, bangs caused by parasitics
alone are most likely about zero percent.
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.
73, Tom W8JI
w8ji@contesting.com
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