Greetings All: I have excess to my collection an extra S-20R.In good working order. I would love to trade for a hallicrafters model I don't have. That being one of the following. S-19 S-19R S-20 S-21 S-22 S-22R S-29 S-72 also looking to buy ot trade for a SX-32 and a SX-62. And even needing a S/SX-17 parts unit. Thanks