While the ferro-resonant transformer seems like a good idea
at first--there are some issues. The main thing is that they
work at a single line frequency. So you can't use only one
transformer for 50 and 60 Hz. And they show reverse
regulation with variable frequency line voltage from generators.
Plus they are relatively bulky and expensive.
A more viable solution -- is active regulation with a Triac
and an RMS detector.
But this means that the vast majority of hams would have to
pay for something they don't need just to aid the few that
have out of spec AC line regulation.
Life is a balance between what is realizable and what is
affordable. Get used to it. ;-)
John W0UN
>Thinking about the issue of keeping the filaments cooking at +/- 5%
>of nominal rating for longest life...
>
>Seems to me that a saturable core type transformer would fit that bill
>perfectly... certainly would regulate the voltage. You know, similar
>to those 120v AC supplies that do the same trick.
>
>In fact, I think I have some that are 6.3v saturable core trannys from
>something or other... obviously you'd need some that were wound *for*
>the desired voltage.
>
>Anyone got any thoughts on this?
>
> _-_-bear
>
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> _-_-bearlabs
>
> http://www.bearlabsUSA.com
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