Vintage Simmons Drums (UK) Users Group

Hi everyone, my first post here.

So I bought a Simmons SDS7 kit on Ebay a few months ago and finally got around to having a good look at it this week.  Being a child of the 80's I've always wanted a Simmons kit and kind of got this by accident.  It's also my first drum kit.  Anyway...

Unfortunately, the bottom of the kick pad shell got damaged since I took possession but other than that all seems good.  I managed to plug the brain in a while ago and everything lit up on the front panel but I can't actually test it because I don't have anything to hear it through (ie like an amp) and there doesn't seem to be a headphone jack anywhere on it.  So, can any of you recommend a suitable way of hooking up some headphones?  Do I just need an XLR-to-headphone socket adapter or something else?  I can't make too much noise because the neighbours will get upset.

Thanks all
Jon