Can Levinson 512 be directly connected to a headphone ?

Thank you for so detailed explaining.
When directly connected from " Variable-Pattern"   two RCA outputs with
an  adapter cable for  two RCA to one headphone plug, after playing music for about 2 minutes, the 512 froze up and had to be powered off then on again to get it well.
Is it possible the problem was from a mismatching ? or, the 512 is bad and probably should be sent to be checked up/repaired?

Many thanks!

Hi Al
Your answer and instruction are great, very very helpful !
More and more l intend to have a  project that I should use a formal highend headphone amp to get rid of those electronic things that must be taken into consideration.
By the way, in your first reply, you mentioned "   You would also have to provide a means of adapting the headphone’s plug to the player’s two RCA outputs, of course." If not that kind of simple cable shown by the link you gave above, what pattern of adapting apparatus (  some kind of adapter ? special cable ? or even an adapting box......) can be used?
Could you also suggest a link to know?

Thank you again !

Thank you so much !
Happy weekend !