Regarding the 2 resistors (100R, I believe) at the termination of the heater supply in the Francesca pics: Are these present to create a virtual center tap in the absence of a real center tap on the PT heater supply Could they be placed anywhere along the heater circuit
Thanks
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Yes
They also act as fuses
You should place them where you want the heater ground to be, sometimes that makes more sense near the front by the ON Lamp if it is heater powered