Just picked these two vacuum tube radios at a garage sale for $10. Can anybody tell me anything about them? The Zenith has 3 tubes and says it's 30 watts, but it is missing it's speaker. Any ideas what I can put in it as far as a speaker? The other is a Sparton. I can see one of the tubes from the back but can't tell how many it has. The Sparton is made of wood and is pretty heavy, whereas the Zenith is plastic and light. The Sparton works great. The Zenith, I can watch the tube glow so I think all it needs is a speaker. At any rate, I think they're neat!