Quote from: txflood on December 19, 2014, 11:12:13 AMThanks for this tip. I did get the specs from Ashdown now on the OPT and I'm guessing that it is bad as the drawing shows 8K ohms resistance on the primary windings. I am measuring a little less than 600 ohms.The 8K figure is impedance, not resistance. Impedance is an AC only spec. and we can't measure it with a normal type meter. We can measure DC resistance but it will give a much lower measurement. Your 600ohm resistance reading does not seem low at all, some amps OT primaries measure even lower.
Wouldn't this low primary resistance explain R76 burning up feeding the CT of the OPT?
R76 does not feed the CT. Rather it feeds everything after the CT and the fact it is burning up implies the problem could be anything other than the output transformer.