Columbia Radio Corp. Screen Grid 8 Get a print! $8.00 Add to Cart Product Information: Model:Screen Grid 8 Manufacturer:Columbia Radio Corp. Schematic Pages Page 1 Schematics Content Page 1: COLUMBIA RADIO CORP COLUMBIA SCREEN GRID - 8 Line Voltage 115. Set on Low (1) Volt Tap. Volume Control Position Maximum. 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!