(2) Amperex Bugle Boy 12AX7 ECC83 Treble Clef Vacuum Tubes | 1959 Production |  Matched Codes I6I Δ9L/J

Tested for mutual conductance (Gm) on a military grade Hickok TV-7B/U tube tester recalibrated on May 1st 2026.

Tube 1 tests at 54/50 and tube 2 at 48/52 with 32 being the minimum score for a good tube (with 65% life remaining).

I'm always happy to combine shipping so please feel free to reach out with questions on any of my other listings. I add new listings daily but can only list a small portion of the tubes I actually have so if you're looking for something you don't see, message me directly and I'll be happy to help. 

Your tubes are always securely packed for fast shipping!