Just measure the resistance between the two 0V leads, if short then it's obviously a centre-tapped transformer.
Well crap, that makes sense. Resistance across the two 0V wires is 1 ohm. Just for S&G, I measured resistance across known 4 ohm 10% wire wound resistor and it read 5 ohms.
My battery in my DMM is dying, so I will replace it and recheck later...
My battery in my DMM is dying, so I will replace it and recheck later...
Resistance across both 0V are .9 ohm. Resistance across both 40V wires are 1.8 ohm.
So its the same single winding.
So its the same single winding.
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