[TR] [Wedge] coil questions

[Benjamin Zwissler]

Sujit,

Coil technology hasn't changed dramatically, but I'd get new one regardless
as the insulation may be degraded in a 40 year old coil causing it to
perform poorly or fail.  They're cheap and you don't want to spend time
troubleshooting only to find out the 40 year old coil is dodgy.

I can't argue with your math, but in my experience coils are typically sold
as 12V or 6V or "internally ballasted" or not.  You want a 12V or
"internally ballasted" coil if you're removing the external ballast
resistor.

Ben...

On Tue, Apr 4, 2017 at 10:12 PM, Sujit Roy <triumphstag at gmail.com> wrote:

> I have a spare coil dated '73.  Has technology changed so much that I
> should discard this and when needed buy a modern one?
>
> There are so many vendors claiming hi tech coils. Is this a load of
> baloney?
>
> My Stag has a ballast resistor so for starting a full 12 v is supplied to
> the coil on general running 6 volts is used. Am I killing my coil by
> spiking it with 12 volts?
>
> The resistance of the coil is specked at 1.5 ohoms.
>
> If I remove the ballast resistor and just supply 12 volts all the time,
> should I now get a 3 Ohm resistance coil?
>
> Based on the current and calculations below, this sort of make sense. Am I
> right?
>
>
> V=I xR
> 12 = I x 3 I = 4A
> 6v = I x 1.5 I =4A
>
> Sujit
>
>
>
> --
> Sujit Roy
> Cupertino, California
>
> https://triumphstagblog.wordpress.com/
> --
> Forwarded via the TR7/8 mailing list. Please send administrative requests
> to the majordomo at tr8-request at mercury.lcs.mit.edu
>



-- 
Ben Zwissler
bjzwissler at gmail.com
Columbus, IN
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