Hello Roy & Will,
Could there be a relationship between your night vision and my dream of
UFO's last night.......!
BTW I'll go for a regulated DC filament supply. Fortunately the indirect
heater of a GU84b is 27V @ 3.5 A
Have fun.
73 Jos
-----Message d'origine-----
De : amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] De
la part de Will Matney
Envoyé : samedi 30 octobre 2004 0:31
À : amps@contesting.com
Objet : Re: [Amps] A thought about regulating fil voltage...
Roy,
I take it your talking about an AC shunt regulator using two zener
diodes back to back? If so, it would work providing the zeners watt
rating was large enough.
Will Matney
Roy Koeppe wrote:
the easy way??
It came to mind that two series strings of hefty, stud-mounted, low
voltage diodes could be installed back to back polarity across the
filament, effectively acting as a shunt regulator (ahead of the
filament
choke in case of GG service). Without the diodes in the circuit,
voltage
would preliminarily adjusted to slightly higher than normal. Then the
proper shunt diodes would be installed to clamp it down to the correct
value. Ideally not much current would flow into the diodes, maybe on
order of a few amps. The diodes would be RF bypassed.
Now, when you key up the idling current, and more so the full RF drive,
filament voltage could thus be stabilized.
I have not tried it--I just saw it in a 'night vision'.
Thoughts please.
73, Roy K6XK/0
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