> I would still like to see a resistor between gate and cathode to
> lower the sensitivity to stray hum and EM stuff triggering the SCR

What would you suggest ? I see quotes that some SCR in-built
resistors are as low as 20 ohms. Others suggest 100 ohms, eg

http://www.microsemi.com/micnotes/601.pdf

I was initially thinking a few k perhaps

--------------

Reading these two for a little education

http://www.allaboutcircuits.com/vol_3/chpt_7/5.html

http://electricalandelectronics.org/2009/04/13/thyristor-gate-characteristic
s/



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