@ClaraListensprechen@universeodon.com @Ralph058 @SrRochardBunson @sergio_101 Yes, Sams Photofact books and manuals. I remember them. They also published schematics and other info on every make and model of TV and radio for repairmen. (This was back when people repaired TVs and radios. The TV repairman would come to your house, replace bad tubes, make some adjustments, so you could watch Ed Sullivan.)