In my opinion, a channel can be whatever you want it to be in terms of genre. I've always swapped and changed the content I make and my subscribers have supported that so far, but I wouldn't worry about it too much whilst your channel is smaller - it's when you grow as a channel that more people will be bothered.
Another way of thinking about it is that regardless of subscribers, if you're putting out a variety of content on a variety of subjects, then as long as it keeps coming up in YouTube search, people will see it and that will earn you money (If you're interested in monetization that is). Try not to wait hand and foot on just your subscribers.
Do whatever you feel you want to do for your channel, and as some of the other members here have rightly commented - experiment with it and see what works best for you.