FOR SALE: Transmitter type BC-458A covers 5.3 to 7.0 MHz. Manufactured by Columbia Radio Co. It Includes one crystal, all tubes except for the finals. Silver case. Will sell for $35 plus shipping. The other ARC-5 type transmitter that I have is a model CBY-52208. Department of Navy. Covers 3 to 4 MHz. Comes with all tubes and one crystal. Black case. Will sell for $40.00 plus shipping.