5751 will give you more headroom and a cleaner sound. I believe you need to go in the other direction. Try a NOS RFT 12AX7 that tests higher gain than normal in V1 for earlier breakup.I am going to try a JJ 5751 this weekend. Other possibilities are 12AT7, 12AY7, and12AV7, but I hear they improve headroom, and that's not what I'm looking for.
The most gain is the X, gain factor of 100. 5751 is just a notch lower at 70. T=60, Y=44, U=20.I've used the 5751 when I wanted to get just a little cleaner and it worked great with very nice tone.I am going to try a JJ 5751 this weekend. Other possibilities are 12AT7, 12AY7, and12AV7, but I hear they improve headroom, and that's not what I'm looking for.
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