Beautiful telefunken ECC83 12AX7 tube.  Made in Germany 

Label extremely strong

Halo getter

Diamond on bottom 

Ridged plate 

This tube has been fully tested as new on my Hickok 539C for Gm, leakage, gas, life, and plate current draw, as well as screened for gain, and excessive noise and microphonics on my maxi-preamp 2

Hickok 539C minimum gm for new tube is 875 Tests results are as follows:  

Note: in high gain circuit this tube may be a bit microphonic. Recommended for low gain or phase inverter position 

Triode 1: 1200 at .6

Gain 88.7

Triode 2: 1300  at .7 mA

Gain 89

Strong and wonderful sounding tube! 

I am passionate about tube audio, and I put all the tubes I sell through a meticulous and careful screening process so that you can be confident that the tube is top quality and accurately represented.

Photos are of actual tube for sale. Shipping is free in the continental USA. Please check out my other auctions and add me to your favorite seller list so you don't miss out on my vintage tube, electronic, and musical equipment listings. Thanks for looking and good luck! :)