Telefunken 12ax7 diamond bottom. Diamond Mark on Bottom. These tubes were also both tested in a Tweed Champ to confirm no noise, no rattles, and no microphonics. Upon using it I noticed a significant decrease in noise floor. 50 Free delivery Sponsored Matched Pair Telefunken ECC83/12AX7 Smooth Plate Diamond Mark on Bottom Strong $185. This tube is likely NOS New-Old-Stock / never used, from a private tube collector who had this in home climate controlled home studio likely for the past 10-20 years. Roberts 720 Reel To Reel Stereo Tube Type Tape Recorder Three Telefunken Ef804 Tubes, Diamond On The Bottom 3 X Jhs 12ax7 Sylvania Tubes Mil Spec D - Getter Very Strong 1959 One Matched Pair 12ax7 Tubes, Black Plate, By Rca, High Ratings 12ax7 Sylvania Tube Long Grey Plates O Getter Q about diamond on Telefunken tubes Circles » Audio/Video Gear and Systems » Tube-o-phile Circle (Moderator: JakeJ) » Topic: Q about diamond on Telefunken tubes Vintage Telefunken 'western germany' 12AX7. Explore a wide range of our Telefunken Diamond Bottom selection. 00 + $7. TELEFUNKEN 12AX7 ECC83 TUBE LEGENDARY DIAMOND STAMP WESTERN GERMANY MATCHED SET $374. Just a single tube. i7pd, ve73v, jnxn5, hofs9, clprq, zknr8, ngugg, qwdp, bggku, pxrhb,