Joined: Jan Fri 17, 2014 7:26 am Posts: 1877 Location: In the village, 19115
For someone who has a particular Jackson VTVM, a 3A20 tube is used in that unit. viewtopic.php?f=8&t=334464&hilit=3a20 Probably nothing else requires that tube.
_________________ I like things that light up, tubes, bulbs, LEDs, whatever, and things that make noise.