Selmer 30SV – someone modded it from EL506 to EL34 and swapped in a replacement OT. Had a hunch it was wired incorrectly... Secondary.
3 taps. Four wires are Black, Brown, Orange, Green.
Black was wired common.
FADED HAND-WRITING on the casing, I can just about see that someone wrote BROWN is common. So I'm scratching my head.
I have a Fluke 179 meter; doesn't read low resistances very well, so I can't trust simple DCR measurements across the taps.
With BLACK as common, turn ratios looked like this:
GR–8:1
BR–11:1
OR–38:1
Using ORANGE as common:
GR–11:1
BR–17:1
BK–38:1
Using GREEN as common:
BK–8:1
OR–11:1
BR–31:1
Using BROWN as common:
BK–11:1
OR–17:1
GR–31:1
I got these results by sticking a fixed AC source across the primary legs and measuring voltage on the other side. Divided primary V by secondary V.
My question is: does that jump up to the 30s seem out of whack? It happens between Black & Orange, and Green & Brown... I'm still scratching my head, drawing it out...
Am I losing my mind?
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