McIntosh manual recommends 12 inch of air space above the amp(tube) for adequate ventilation. My rack only allows about 8 inch of space above it. Does it sound like a problem that I should address with a cooling fan perphaps?
In addition to the 8 inches you have above the unit, is there open space in front of and behind the unit? (Is the unit on a shelf in a rack or inside a cabinet with a back and/or a door?
With all sides open and still having 8 inches above, I don't think you will have any problem at all with amp overheating or tube longevity, and do not need a fan. If you wanted to be extra careful, you could run the amp with the cage off, but again, I don't think that is necessary.
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