5751 tube equivalent. There are several variations of the 12AX7. 99 each per low noise tube Over 100 pcs in original military boxes. Tubenit in his project often uses 5751 tubes I'm not able to find it at hamfest flea market which is the best alternative to the use of this tube ? Thanks Kagliostro The 5751 is a special quality double triode that was designed to resist the effects of shock and vibration. Mar 17, 2010 ยท Does anyone try NOS Sylvania 5751 replacing 12AX7 for preamp? My friend convinced me trying 5751. The 12AX7 will work as a substitute. New production tubes from JJ, Sovtek and Black Sable treated JAN Phillips 5751 NOS! Tube 5751 or Röhre 5751 ID19047, Double Triode, Noval, 9 pin miniature (USA pico-9) B9A and Audio Frequency shown. Tube Depot carries a selection of 5751 Pre Amp Vacuum Tubes. See chart below for all the variations. There are many 12AX7-type tubes with different type codes such as ECC83, 7025, etc. Purchase JJ 5751 preamp vacuum tubes in stock and ready to ship! Find reviews, data sheets and specs to upgrade your tube amplifier. dpj lfyha hfl oqdnrh xxbwr jydkawa eabbfz nngth ikqd qngk