How much air circulation do have available to it? How much spread between other components . My 770 was in a temporary open rack, (AV but looks like a bakers rack) for months. Most air possible to give an amp. Runs warm, - yet not hot. Moved recently to a wood cabinet with open back and a side metal mesh vent near it. You can feel the ‘chimney’ convective effect through this vent. Need to double check but have not noticed it running too hot in this new installation.