Telefunken 12AX7 Diamond Bottom

Telefunken 12AX7 Diamond Bottom

These are the real deal Telefunken 12AX7s made in western Germany with diamond logs etched in the glass at the bottom of the tube. This is generally considered to be one of the best 12AX7s money can buy. It is fully ended and is incredibly accurate. This is not a tube for someone who wants a ton of warmth of bloom, this is for someone who likes the smooth expression of tubes, but also likes the detail that a solid state solution can provide. We have 4 of them and can make matched pairs if needed. These are new, please allow for some variation in silk screening (or lack of) as it is nearly impossible to handle the tubes without removing the silk screen. 

All tubes are tested on a AT1000 computerized tube tester at real world operating voltages (250 volts in the case of the 12AX7), one tested tubes are also matched at those voltages. For power tubes we match based on EM first and then GM. For small signal tubes we match based on GM then EM. 

Please be aware that vintage vacuum tubes are antiques and carry no guarantee or warranty. We provide a sheet explaining what you purchased, your test results for your tubes, and if need be can provide photographs of the tube on the tube tester before we pack and ship them.