How is this servo amplifier made work in SPICE?
You choose the wire resistance at the hot temperature then the voltage divider on both inputs are matched. (Virtual gnd. or null)

Since feedback is open at Vout=0, very slight cooling will force Conduction as the inverted input lowers and output rises. Since when Vout=0, it has open loop gain, the changes are negligible for the set point.

R0 &amp; R2 are reversed. Pls fix that.