Quote:
" I get 1.8 ohms across the ac line with the filters disconnected."
That seems a bit low. 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.
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1.8 ohms isn't outside reason. I just measured the primary of my RCA TV set (it works quite well, other than a weak CRT that wants a brightner to work well) from 1957 and got 2 ohms (using a DVM on ohmmeter mode across the power plug pins with the set's power switch turned "on", which presents to me the transformer primary without having to take the back off the set). The impedance of the primary winding of the power transformer at 60Hz is what limits the current to a lot less than a pure 2 ohm resistor would draw.