TV-7 Series Tube Tester - Calibration Tube Set - TV7 TV-7-D/U TV-7

Description

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.
Tube may be used (which is actually a good thing for calibration tubes).
Tube in picture are just representative, not the actual tube you will receive.
We use brand name tubes such as RCA, Sylvania, Tung-Sol, etc. for making these sets.
These tubes are tested for shorts / gas before calibration.
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
Note: on the 12AT7, we only mark one side of the tube.  I have found in marking both sides, it confuses some newer techs thinking they need to calibration two "circuits" in the tester to "calibrate" both sides, when in reality, the only difference between one side or the other is the tube pinout selections via the knob settings and once the "c" range is setup.
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.  There is an additional charge for this service as it takes time to do this.
Tube Tester NOT Included