03-13-2016, 01:36 PM
Yep, looking at the bottom of the tube, with the two large pins at the 7 and 5 o'clock position. Pin 1 is the 7 o'clock large pin and count clockwise from there. A great resource is the tube database you can find here http://www.nj7p.info : click on the Tube SQL Database, enter your tube number and click on LOOKUP
The 78 tube looks like this
[Image: https://dl.dropboxusercontent.com/u/54621529/78.png]
The 78 tube looks like this
[Image: https://dl.dropboxusercontent.com/u/54621529/78.png]
