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[Amps] Speaking of filaments...& regulation

To: <amps@contesting.com>
Subject: [Amps] Speaking of filaments...& regulation
From: 2 at vc.net (2)
Date: Tue Feb 4 07:12:15 2003
A rheostat in the primary of the filament/heater transformer is a 
convenient way to adjust filament/heater V.

>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
>>
>>--
>>   _-_-bearlabs
>>
>>    http://www.bearlabsUSA.com
>>     - Silver Lightning Interconnects & Custom Mods -
>>
>>
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>
>
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-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, 
www.vcnet.com/measures.  
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