Hi, Paul: I purchased a T4-XC with MS-4 speaker and AC-4 on the cheap. The rig, etc., are in really nice shape and the cabinets of the T4-XC and MS-4 had been repainted beautifully.
The T4-XC had an 80-mm square dc fan on the back of the PA cage. Two screws to mount it at the top and a tie wrap on the left hand side (as viewed from the back). On inspection, the feed for the fan was the 12.6Vac filament line with only a 1N4000-series diode in series. The fan runs very quietly; it is produced by "PPM," (Pony Precision Motor Co. in Taiwan), model FBA-9, brushless and ball bearing. Any 12Vdc fan would probably work and you can find the 80-mm fans in abundance from the computer stores. If you want a higher speed from the fan, add an electrolytic capacitor the output of the rectifier to increase the average dc voltage. 73, Bob K9JU
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