I have the L-509x which is biased to operate 6 watts (8ohm load) Class A.
I have it mounted in an open equipment rack with 4 1/4" clearance above and 4" to each side(but closed off to the left and right by flanking Sorice glass door cabinets for LPs).
As an experiment, I put a free standing dial oven thermometer over the right side vents, middle from front to back.
After playing the unit for 3 hours, the dial reads 99F.
Just fyi....
I have it mounted in an open equipment rack with 4 1/4" clearance above and 4" to each side(but closed off to the left and right by flanking Sorice glass door cabinets for LPs).
As an experiment, I put a free standing dial oven thermometer over the right side vents, middle from front to back.
After playing the unit for 3 hours, the dial reads 99F.
Just fyi....