07-09-2010, 09:56 PM
Is the transformer physically charred? Then the answer is yes, the extra current overheated the windings. It wouldn't have melted the copper wire, but could have caused a break at a weakened (corroded) spot. The current couldn't have been too excessive, though; it was limited by the power transformer, rectifier, DC resistance of the primary, and the emission capability of the 6F6.