Here are 2 vintage Electron Amplifier Radio Vacuum Tubes. One is an RCA 6BY5 which tested on my TV-7 at 56/56 and minimum values of 40/40, so good tube. and the other is a Sylvania 3DG4 which tested at 82/90 with minimum value of 80/80.

I purchased a large collection of mostly NOS vacuum tubes which I will be listing so be sure to check my other listings.