If you’re an uncompromising collector of antique technology, make sure to check out all my listings after you look at this one. I don’t think you’ll find a better, broader or more balanced assortment of technical antiques anywhere — hundreds of listings each year, almost all of them featuring eye-popping “gee whiz” gadgetry in exceptional original condition. Here are three working Western Electric 216-A amplifier tubes with good emissions. When tested on a Dan Nelson calibrated TV7/U tube tester, with 6.3 volts to their filaments, the tubes scored 44/35, 45/35 and 54/35. They were further tested in an early 20′s battery amplifier, and they all work well.