convert C20 to a headphone amp?

Is there a way to convert mcintosh c20 preamp to use with headphones?

There are two jacks but it seems that is not for headphone.

el34tube03-08-2014 10:05pm

gmfgmf1 Details Discussions Posts This discussion Message User 1 posts 04-01-2014 at 04:43pm Copy Comment URL Report Comment Edit Delete Same question here - someone bought me a headphone and all of my old tube preamps do not have jacks