I have no idea if anybody has posted this before but if anybody has the time and patience its not too hard to build .
Keep in mind this is a "proper " tube tester in that it employs a Wein bridge oscillator to test the tube .
The circuit is available in issues of ETI magazine -
Volume 26-number 8 and volume 26- number 10.
It can be accessed on that wonderful American radio heritage website -
RADIO and BROADCAST HISTORY library with thousands of books and magazines
Keep in mind this is a "proper " tube tester in that it employs a Wein bridge oscillator to test the tube .
The circuit is available in issues of ETI magazine -
Volume 26-number 8 and volume 26- number 10.
It can be accessed on that wonderful American radio heritage website -
RADIO and BROADCAST HISTORY library with thousands of books and magazines