Happened to be able to purchase a used ADA PTM-1260 on eBay that was in need of repair. In addition to a cold solder joint on the 12v trigger, it had a bad fan. Looks like the design of the PTM-1260 has changed slightly. This fan was an ETRI 141LV 115v fan. I pulled that out and replaced with a Papst 4140N -- just because it has been rock solid in my other PTM-1260 amplifiers and is quiet. In addition to the change of the fan manufacturer, the board layout changed slightly. I have included photos of the layout and new fan install -- nice and quiet now.
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