I have been thinking about buying a variac to modulate thermal control on my Mag-20. What I would do is peg the stock thermostat to #10 and use the variac to finely control the heater. Has anybody does this with any success? I am not really happy with the stock "bang-bang" heat control on the pot. I have considered using a PLC to run a PID but before I get that far I want to try a simple variac.
(FYI, for those who don't know, a variac is basically an adjustable transformer that allows the user to control output voltage, in my case, from zero to 120 volts AC)