A week of deep Google searches and an eventual exclamation of "Thank you online discussion boards!" uncovered the problem. A few Variac voltage experiments over the next few days, along with some obsessively created Excel calculations and charts, verified that a wall voltage of 105 would be more appropriate. Its original Mullard EL84 power tubes were being overloaded at almost 17 watts, while 12 watts is the designated maximum and 14 watts would be pushing my luck. However, the readings I got when checking the internal voltages were sky high.
wall voltage to be a few volts higher than its nominal 120, but still within reason for powering the amp at the 115 setting. The AC15's international voltage selector on the far right of the control panel has settings for 115, 160, 205, 225 and 245 volts. That meant replacing the electrolytic capacitors before daring to turn it on, since they have a life span. (full disclosure: many years ago) and finally got around to restoring. I recently had a revelation about a beautiful, fawn-Tolex-covered, circa 1960 Vox AC15 that I bought from a dealer in the U.K.
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