[AMRadio] Filament Voltage

[Gary Schafer]

wwd at netheaven.com wrote:

> >I have very poor filament voltage regulation on the Gates BC1-J.
> >Dan
> >KJ7FX
>
> Time for a new 30A 240v cable run to the shack. I trust the Gates does not
> have only 120v primary like the T-368. For my T-368 I've collected a few
> ~20 lb 440/220<=>220/120 transformers so the T-3 will source thru both
> legs only, and not thru the neutral. If this doesn't actually improve
> voltage regulation it will at least balance the load.
>
> Otherwise, this would seem to be a perfect candidate for a modern
> solid-state solution. But I gag on using SCR's or the like, given their
> propensity to scatter broadband hash in all directions. Anyone have the
> elegant fix?
>
> Bill        N2KQA
>

A relay and two pots. One to adjust transmit voltage and the other for standby voltage.

I don't know about the 833 but in looking at the tube manual on the 813 they recommend that if
the standby period is less than 15 minutes, the filament voltage be reduced to 80% of normal.
If the standby period is greater than 15 minutes, turn it off.

73
Gary  K4FMX