Columbia Radio Corp. Diagram "B" Get a print! $8.00 Add to Cart Product Information: Model:Diagram "B" Manufacturer:Columbia Radio Corp. Schematic Pages Page 1 Schematics Content Page 1: COLUMBIA RADIO CORP DIAGRAM B. The Columbia Sereen Grid 8 Circuit 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!