[R-390] Beaten Horse Graveyard (was SS VR replacement for 3TF7)

[Tom Norris]

I guess this year it's time to draw a schematic of my servo-driven
ballast-replacement/soft-start/line AC regulator system.  I only
yakked about it last year....


Tom


On Jan 3, 2006, at 8:17 PM, Les Locklear wrote:

> Uh Oh..................do I smell another Dead Horse moldering in  
> the background?????
>
> Maybe the infamous Keilballast, or the <gasp> 12BH7 or even  
> worse.......Ta Da.......Shades of the Salem Witch Hunt, "TOTALLY"  
> solid state Chuck Rippel's adjustable "Ballst Tube Eliminator."   
> Who knows what eveil lurks behind closed  
> doors...............MUAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!!!!!!!!!!!!
>
> The Shadow Knows........................
>
> ----- Original Message ----- From: "Cecil Acuff"  
> <chacuff at cableone.net>
> To: <Flowertime01 at wmconnect.com>; <r-390 at mailman.qth.net>
> Sent: Tuesday, January 03, 2006 7:39 PM
> Subject: Re: [R-390] SS VR replacement for 3TF7
>
>
>
>> My Favorite is a piece of Teflon coated aircraft wire with a  
>> couple of Mil spec RS-232 male crimp pins installed, shoved into  
>> the socket in the appropriate place and a pair of very common  
>> (read cheap) 12BA6's in place of the 6V versions.  It don't  
>> regulate but neither does the resistor....not in the same way as  
>> the ballast tube.  The ballast tube absorbs voltage changes by  
>> varying it's resistance and corresponding voltage  
>> drop....something a resistor can't do.  In fact I would think the  
>> tubes are ballasting the resistor in that method of  
>> substitution....but it does work acceptably....as does the jumper  
>> and 12V tubes.
>>