Hickok TV7 Military Tube Tester for Radio & Audio Tubes
Hickok TV7 Military Tube Tester for Radio & Audio Tubes. Here is the tube tester that most people who deal with tubes use. This one was just repaired and calibrated by Daniel Nelson, who is the expert on TV7s and it works great. I can't live without these testers and usually have half a dozen of them at any one time.