The TV-10 is not a very well known tube tester. There just wern't very many of them made. It is basically an upscale version of the ever popular TV-7. Like most other US military tube testers, the TV-10 is a mutual transconductance tester designed by Hickok.
Features Uses the mutual transconductance method of measuring tube quality.
This is the most reliable method known for assessing tube quality. Built in roll chart for popular tube settings.