Manual Tube Charts Updates CHOOSE NRI 67 68 69 71 Tube Tester, has 6BQ5 EL34 etc

Description

Complete manual for NRI (National Radio Institute) tube tester.  Choose Model 68 (67), Model 69, or Model 71 tube tester.  Some of these models are very similar, and the 71 is totally different.  The Model 67 is identical to the 68, except that some 67s were shipped without the 9-pin miniature (Noval) tube socket installed.  The 69 is just like the 68 except it has a built-in roll chart. You will get the manual model you choose.
Many of these Model 67, 68, & 69 testers didn't include newer tubes (EL34, EL84, 7591, 6CA7, 6BQ5, etc.) in their charts.  Included in this documentation set are supplements that will let you test most modern audio tubes.  Even the 7868 is in the charts but these NRI testers don't have the necessary socket so you'll have to make an adapter if you want to test those.
Model 67, 68, & 69 charts and supplements include hundreds and hundreds of tubes.  Many European tubes (ECC83 etc.) are also included as well as Compactron and Novar tubes. With these supplements, your NRI Model 68 tester can test many radio and TV tubes that fit the available sockets. If you have a specific tube you want to test, message me and I'll tell you if it's in the charts.
The Model 71 tester is much newer and its roll chart includes many of the newer tubes.  The Model 71 manual set updates the roll chart with a supplement and also includes instructions (summary and comprehensive).
Each manual also includes a schematic and parts list.  The 67-69 manuals also have the procedure to make your own tube test data for a tube which is not in the charts.
Let me know if you have any questions.