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On that type of transformer, you'll see anywhere from about 300 to 500 ohms from the CT to the ends, but they'll never share two precisely identical ohms readings because of the way the primary is wound. As fazer said, what you want is the reflected secondary-to-primary impedance, not the DC resistance. Here's a good, well-written resource explaining it.Personally, I'm not a fan of Mercury OPTs and would only use one here if no other option existed. If there's not a Hammond cross-reference and the repair time isn't critical, I'd call Heyboer with the physical dimensions and desired leadout colors, and have them build one. CJ is the resident expert on guitar amp iron; maybe he'll chime in here with a better solution.
On that type of transformer, you'll see anywhere from about 300 to 500 ohms from the CT to the ends, but they'll never share two precisely identical ohms readings because of the way the primary is wound. As fazer said, what you want is the reflected secondary-to-primary impedance, not the DC resistance. Here's a good, well-written resource explaining it.
Personally, I'm not a fan of Mercury OPTs and would only use one here if no other option existed. If there's not a Hammond cross-reference and the repair time isn't critical, I'd call Heyboer with the physical dimensions and desired leadout colors, and have them build one. CJ is the resident expert on guitar amp iron; maybe he'll chime in here with a better solution.
