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it's a regular transistor ECG238 will work. you have to remove the regulator board, jump the capacitor on the wing by the regulator board, put on isolation transformer with a variac and bring up slowly from 90 to 95 volts. You were going into shuit down mode. If the 3.9 ohm is gone, check the diodes on the input power. The start diodes are on the small board in the front of chassis.
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