I am one of those still flying 72mhz. I have 3 radios I bought off ebay and one Hi-Tec 6 channel bought new 6 years ago from Tower. I have replaced the batteries in three of the radios and thats it. They all work without a hitch. And I am normally the only one on 72 at the field. So I have the whole thing to myself. I have a S.P.A.D. Stik I use as a test plane for my radios. So far never a problem.

I just bought a Futaba Tx off ebay for $65 with shipping. It has a brand new battery, came with two receivers and that included the free shipping. Its a Skysport 6A. My most favorite radio of all I have owned. It has 6 channels, two more than I need. End point adjustments and duel rates. Several mixing features I will never use and easier to set up than a computer radio to me. I have two computer radios but prefer the 6A for ease of use.

So I am all for the OP putting his old radios to work. He can always up grade. And getting a new 2.4 radio like Mash39 mentioned doesn't include the switch and receiver pack. And may not include the Tx pack. And you will still need a charger and leads. So there are more cost than it sounds like at first. Too bad they don't sell complete radio sets like they use to that had batteries, receiver, servos and charger so a beginner could just buy and go fly.