10-17-2019, 12:57 PM
For what it's worth -
I use a Heathkit TT-1A mutual conductance tube tester. Mine didn't have the roller chart but has all of its manuals, so I have to use the manual to test tubes. But that isn't a big deal. I bought it at an auction of a former radio-TV repair shop in Beaver Dam, KY well over 30 years ago. Best $2 I ever spent.
Several years later, I recapped it to keep it in good working condition.
I use a Heathkit TT-1A mutual conductance tube tester. Mine didn't have the roller chart but has all of its manuals, so I have to use the manual to test tubes. But that isn't a big deal. I bought it at an auction of a former radio-TV repair shop in Beaver Dam, KY well over 30 years ago. Best $2 I ever spent.
Several years later, I recapped it to keep it in good working condition.
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Ron Ramirez
Ferdinand IN