FD5: The Tubes: Part 1: Gray Tubes, 1959 Fender Deluxe Tweed 

I discuss the gray tubes that were found in this amp and provide the reason for developing gray tubes as well the application for which they were primarily developed.
If you have gray tubes, play them until they wear out. Mostly for bragging rights.
Original Work, Copyright 2022 James D. Whiteside, II all rights reserved, For consideration only, no reproduction without prior permission.