Here is what I understand from the consensus of opinion:
1. VHF Parasitics may develop sufficient amperage
such that filaments may physically distort.
2. Some sort of oscillation can happen as a result
of mis-tuning, etc., that may be called "parasitic."
3. The Q of the Lsup device may or may not dampen
oscillations or events that may cause filament sag.\
4. Some 8877 amps have used Lsup devices, some
have not.
5. Some commercial manufacturers use Lsup
material(s) that are higher resistance than
silver strapping with no attempt at an added
series inductance.
Why then, is there anyone using Lsup circuits, and
conversely, why is there anyone not using Lsup's?
I can understand how a tube like a 3-500Z or 4-1000A
can experience filament sag with huge amounts of
inrush current. Is the energy conveyed during a
"grid excursion" enough to distort a filament?
(Let's say we feed the RF drive through the center tap
of the filament xfmr)
With the amount of energy required to deform a filament
where does the power come from, the filament supply?
Again, respectfully,
Hal
W4HBM
[snip]
> Parasitic
> oscillation MAY be the cause for SOME grid-to-filament shorts.
[snip]
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