Hackaday (unofficial) July 3, 2022 9:00pm Testing a Tube without a Tube Tester #toolhacks #tubetester #hackaday posted by pod_feeder_v2 Testing A Tube Without A Tube Tester [M Caldeira] needed to test a tube and didn’t have a spare to do the old swap test. He also didn’t have a tube tester handy. Drawing inspiration from a 2015 video, he managed to cobble …