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These have been sitting on my tube shelves for about 50 years. When I was a Summer Intern at Bell Labs I bought a bunch of them from the stockroom because they were less expensive then 12AX7’s at the tube distributor. I was going to modify my Marantz 7 preamp to use them.
Thankfully, I never got around to doing it.
I’ve listed this as used because the original boxes decayed long ago. It does test perfectly in my Western Electric KS-15750 tester. Both sections are balanced. Each section reads about 1600 Micromhos, with the miscalled for is 950.
Also tested for shorts and gas.
Eventually I’ll be listing 11 more of these once I find the box they are in. Let me know if you’re interested in more and I’ll let you know when I find them.
This listing is for one.
