I would also check that the bulb holder and the cable have not been damaged. I know that the M601 can use the 150W bulb, but I find that the 75W is adequate, and you don't have the problem of the enlarger heating up so much. If your lamp holder is faulty/damaged, I have seen replacements for sale recently on UK eBay, under enlarging equipment in the Darkroom section.
Alex.
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