Hello Jonnieos
I have to say that after reading your question I was curious to get the answer. I own a Musiland US 02 and I just tried it with my AKG K240 Sextett MP (600 Ohms) and was pleasently surprised. Don't expect a very detail amplifier section but the volume was adequate at 50% and the BASS was not underpower at all. The output #2 seem to have a higher gain.
So to answer your question Yes it can drive 600 Ohms headphone (I don't think the Beyer DT800 are harder to drive) but do not expect to get the best of your DT880 from that amp section.
Good luck
Simon