05-29-2014, 08:37 AM
Here are some pictures of a 91B which used the same pattern as your 90, you can see the orientation. [Image: http://i985.photobucket.com/albums/ae335...5_0650.jpg] [Image: http://i985.photobucket.com/albums/ae335...5_0651.jpg]
Steve
Steve
M R Radios C M Tubes