I'm checking an unknown transformer from an old 1970s TV, about a 1kg / 2lb, ~3"x3"x1.5" core
There's 3 windings total, and on the 3rd with 5 wires I measured these resistances
Blk-Blk/Grn 2.16R
Blk-Grn 7.72R
Blk-Grn/Wh 7.76R
Blk-Grn/Red 45.7R
Then with 120V on the primary something seems wrong on the 3rd winding
Blk-Blk/Grn 19.8V
Blk-Grn 17.3V
Blk-Grn/Wh 22.4V
Blk-Grn/Red only 0.026Vac ?? , no DC at all
It's not getting hot yet, no smoke or smell at all. So whats going on, also I'm curious why the 1st pair is so close to the 2nd/3rd pair. Do they use different wire gauge between the taps ?
I measured inductances too, they seemed normal enough
edit
ok the Blk-Grn/red was only 1.1mH whereas the others were 94mH, 71mH, 121mH