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Originally Posted by Chimes
What filters are disconnected? I would do what chad suggest. Disconnect all secondary leads and see if the problem persists. If so, then there are probably shorted turns in the primary.Bill H.
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ALL DC electrolytics, the two AC line filters, along with everything else are disconnected from circuit. I admit that as I stated before I simply pulled the 5u4, which automatically takes 3 or 4 transformer leads out of circuit. On one pin you have to remove the smaller wire that goes to the filters. I checked for pins shorted to ground. No problems. I also left a lead going to the on/off/volume potentiometer-switch. I checked the switch for short to ground. No problem. There is a lead going to one side of the AC line connection. That is not shorted.
Someone made the point that the transformer will likely end up coming out anyway so why not remove it from the chassis. Good point. I guess I took some "short" cuts while waiting to see if I can secure a direct replacement. Sometimes I take stuff apart and get sidetracked or disgusted and it sits in pieces way to long. Or the pieces may get lost. I shouldnt be able to lose a transformer though.
Again I have a good trans in my old 8t-243 but evidently that set is more "collectable" and it is kind of dumb to scrap a good set to fix another. Also although the chassis are identical there are different part #'s on the two transformers. I don't need to confuse the situation any more with thoughts of swapping.
Thanks to everyone for trying to protect me from hastily going and purchasing a transformer to find out that it was never the problem. Last I still think that there should simply be a resistance measurement that would tell the tale of a large short. Transformer checking has always confused me a bit because you usually don't have a set measurement that you are looking for on the particular transformer. Sometimes the winding resistance is listed on the schematic. The 8t schematic is all I have and it is not listed.