Three tubes that have been marked with their calibration values to be used in calibrating the TV-7 series tube testers.  These have been calibrated using a known good tester serviced by a professional.  Included are all three types of tubes needed to test all the ranges on a TV-7.

Tubes maybe slightly used (which is actually a good thing for calibration tubes).

We offer instructions on our website on how to calibrate the TV-7 series:

https://blueglowelectronics.wordpress.com/tv7/

We have also made a 1.5 hour video on the process to help aide you.

https://youtu.be/Ru-AR9HTqgc

We offer no guarantee that these instructions alone will make you successful, you must have a good understanding of vacuum tube electronics to consider calibrating one of these units.  This auction is just for a set of calibration tubes needed to complete the process.   If you don't have the background or skills, please seek out professional help.

I can also provide tubes marked in uMhos if needed for calibrating other types of tube testers, please send a message to inquire.

Tube Tester NOT Included

Sorry, I had to raise my price a few dollars on these as my supply of cheap metal 6L6 tubes dried up.