When I first used my TS-930 on RTTY (power reduced to 50 watts out), after a period of time, the radio died, then later recovered. The supply was overheating and switching off.
The fan (at least the one in my radio) pulls the air out of the back of the supply. It is much more efficient to blow outside air into the unit. This is easily done merely by reversing the leads to the fan.
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