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Primary winding resistance sounds a little low, I would be expecting something like 100 Ohms. Strangely enough, my valve amplifier suddenly went off and I found the supply fuse blown. There was nothing untoward on the secondary circuits but a lamp limiter glowed full brilliance. The primary winding measures just 14 Ohms so I suspect a shorted turn somewhere, probably shorting multiple layers. Maybe your transformer has suffered the same fate, try it on a lamp limiter.