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.