OP--for a definitive assessment on operating parameters by someone who is really going to steer you in the right direction whichever situation unfolds---Join Luxman vintage yahoo group. The moderator there Hans is invaluable for info on Luxman. He is an archivist and a wealth of knowledge on anything Luxman.
I had a vintage class A/AB Luxman once. It did not get hot enough ---there is so called class A and then there is true CLASS A---which may all that is going on here and coupled with internal heat sinks most assuredly results in higher temp. Although I did not read enough to gather whether you bought this used .. As Correct bias is paramount. Contact Hans for his 2c. Actually not sure he is moderator but that doesn’t matter. He is based in Europe I think. One time ordered a manual from him if I recall correctly. Long time ago. Be sure though that you actually communicate with Hans himself.
I had a vintage class A/AB Luxman once. It did not get hot enough ---there is so called class A and then there is true CLASS A---which may all that is going on here and coupled with internal heat sinks most assuredly results in higher temp. Although I did not read enough to gather whether you bought this used .. As Correct bias is paramount. Contact Hans for his 2c. Actually not sure he is moderator but that doesn’t matter. He is based in Europe I think. One time ordered a manual from him if I recall correctly. Long time ago. Be sure though that you actually communicate with Hans himself.