Precise Model III Video #10 - Em Calibration Using a 50L6

I'm trying to get along with the calibration procedure using a 50L6 rather than the specified 6L6. Things don't go so well but I'm not sure it's because I'm using a 50L6. Maybe there is a fault in the machine too. If I had a 6L6, I'd certainly use it.

Radio,radio repair,antique radio repair,vintage radio,shortwave,old radio,transistor radio,electronic repair shop,electronics,electronic parts,capacitors,resistors,transistors,vacuum tubes,electronic test equipment,record player,vintage record player,amateur radio,ham radio,radio receiver,antenna,troubleshoot,troubleshooting,AA5,SWL,