Hi Barry, My 2 cents! A 100 watt Micor lofts along regardless of temp. If you can stand it, so can a Micor. Not all of us have 72 degree air conditioned, clean rooms! If your PA has the BIG heatsink, its continuous duty, the mobile heatsink need some cooling because they are only rated at 35 watts tops! Before starting this into my Micor horror stories, I have had 100 watt V's and U's Micor in building penthouses where it was more than +130 degrees, and one in a grain silo -15 degrees below zero with 3 ft of ice in the lowest level. My biggest concern in the "hot house" was not dripping sweat on the radio. There was a thread here a few years back about your favorite varmint found living or otherwise in your radio cabinet! I have tried to follow the pictures in the Moto manuals, Duplexers on the bottom, PA's on top. 73, Brian, WD9HSY Your kid may be an Honor Student, Your Kid may be a Great Athlete, Your Kid may be a Doctor or a Lawyer, But My kid is in the US Air Force & plays with ICBM's, Inter Continental Ballistic Missiles,
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