A couple more thoughts:
I notice that your output wires are not really twisted pair - more like one wire wound around the other. That will not provide much cancellation. In the case of the output wires, that won't cause hum, so not as critical. But the ideal twisted pair should look like a double helix. That way the wires are actually parallel along the rotation. Your AC input wires are done well.
It is important, especially with heater wiring, to do this well because these carry the largest currents and the radiated field strength is a function of current.
Sheldon
I notice that your output wires are not really twisted pair - more like one wire wound around the other. That will not provide much cancellation. In the case of the output wires, that won't cause hum, so not as critical. But the ideal twisted pair should look like a double helix. That way the wires are actually parallel along the rotation. Your AC input wires are done well.
It is important, especially with heater wiring, to do this well because these carry the largest currents and the radiated field strength is a function of current.
Sheldon
An externally hosted image should be here but it was not working when we last tested it.
Ground buss not so good looking. That's the next area I'll tidy up.
Yes, 2 pieces. PCB attached to the bottom. Makes access to inner workings easy. Top plate set's in a rabbit. Base is my second attempt. Third should be a charm. I'll take a few picks when I return home from a short Holiday in Hawaii. With any luck, there should be a pair of Electra Print OPT waiting to be installed.
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