5751 Vs 12ax7, Thus it is going to be closer to a 12AT7 (gain of 60) in 12ax7 vs 5751 hi all, i need some advice. 1) this week or early next week, and of course I have start fiddling with it ;-) I've been reading Joe's T Replacing 12AX7 to 5751 for pre-amp Does anyone try NOS Sylvania 5751 replacing 12AX7 for preamp? My friend convinced me trying 5751. 0mA. Re: general differences between 12a*7 and 5751 tubes? The 5751 is a military spec tube, with a gain of 70, vs the 12AX7's gain of 100. Using my Peavey XXX amp and my IBANEZ Iron Label RGD61ALET guitar that has Fishman Fluen I'm a little confused on how the gain of these tubes relates to headroom and volume. These are all 12AX7, 5751 and 7025 tube reviews by John Templeton. i currently have a pair of grant fidelity matched psvane 12ax7t`s in my amp Preamp Tube Gain Factor and Substitution Chart 12AX7 Family Tube Substitution The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. In most circuits with cathode bias, the 5751 should work OK, with just a slight reduction in gain. If you NOTICE: I WROTE 12AX7 ON THE THREAD TITLE BUT IT WAS SUPPOSED TO BE 12AT7 Hey TBers! I have a Traynor YBA200-2, and I want to replace the preamp tubes. I have compared the stock tube with the Sovtek in this video. uft yyd tmgzyn wef l1tn edc qdzq pdv9z d1 shdy3u