Sky-Chief Radio Corp. A-221 Get a print! $8.00 Add to Cart Product Information: Model:A-221 Manufacturer:Sky-Chief Radio Corp. Schematic Pages Page 1 Schematics Content Page 1: I.F.456 KC SCHEMATIC CIRCUIT DIAGRAM I.F. - 456 KC Please note: we carry a wide range of products which will fulfill the specifications above. Please use our search function or browse our products to find what you need!