[Amps] A thought about regulating fil voltage...

[Will Matney]

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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