[Music in a bottle]

Well, I've always wanted a Philco 37-610 table mdel and I finally pulled the trigger on a very nice set that functions well. I'll have to get some pictures of it on here. So can anyone tell me what tubes it uses and whether they are availible or not? On a decent set of tubes, how many hours can one expect to see before replacing the bottles? Just curious because I have intentions of listening to a lot of shortwave with this unit!