Precision Radio Products Mfg. Co. 511 Get a print! $8.00 Add to Cart Product Information: Model:511 Manufacturer:Precision Radio Products Mfg. Co. Schematic Pages Page 1 Schematics Content Page 1: Five Tube ALL WAVE SUPER - HETERODYNE MODEL 511 IF FREQUENCY 465 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!