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Users of forced air-cooled tubes such as the 4X150, 4CX250B, PL172, etc., should pay attention to the small print on the tube data sheet which says, "Clean the air system periodically." The blower blades in particular will pick up quite a bit of dust and lint which becomes packed between the blades, with the result that the output of air and the life of expensive tubes are reduced considerably. A pipe cleaner moistened in water is ideal for cleaning both the blower blades and the cooling fins of the tube. Cleaning should be done every two months.
Melvin Leibowitz, W3KET.