Need Help! My Class A Amp Is Running Very Hot

Perfectly normal. The amp has over temp protection. If it were abnormal it would be shutting itself off. This is what class A amps do. 

Read the paragraph under ’PROTECTION CIRCUIT’, on Page 1 of the Luxman AX590 manual: https://onahighernote.com/oahn/wp-content/uploads/2015/01/L590AX.pdfLuxman probably knows, how hot is too hot, for their product and have taken precautions.

Thanks for the info, it is very informative 
so many nice and helpful people here, love this site.

My experience with this amp is exactly that, it runs like a house on fire. But it sounds pretty good too. As some note, Class A amps typically run hot.

I replaced my Mc integrated with a Lux 590AX about a year ago. Wanted to try Class A. My equipment had always been in cabinets. That did not work with the Luxman. Even though the cabinets were pretty well ventilated the Luxman ran so hot that it would shut down after about an hour. So, I moved it to the cabinet top where it has lots of fresh air and I’ve had no further issues. Great sound and good looking unit with all the retro knobs but it needs LOTS of breathing space as it definitely runs hot. Maybe all Class A units do but this seems excessively hot to me.

You can check this with an inexpensive watt meter:

https://amzn.to/2nhr6Iv


Set it to watts and compare to your spec.
And yeah, class A gets very hot.