Well campers my tube testing is complete and the results are in for pre amp tubes in my Fender Blues Deluxe.
Below are options tried including original tube set up:
Original = 3 Fender (Sovtec) 12AX7 - higher gain and more noise than I care for, especially for a "blues" amp, needed to be tamed in many ways
Option 1 = V1 JJ12AT7, V2 Fender (Sovtec) 12AX7, V3 Fender (Sovtec) 12AX7 - reduction in gain, volume and sparkle. I did like this at first but was unsure about the big drop in gain
Option 2 = V1 Electro Harmonix 12AY7, V2 12AX7, V3 Electro Harmonix 12AY7 - two 12AY7's has about half the gain of a 12AX7 which let me turn up the volume and drive tubes before break up starts, warmer better sound
Option 3 = V1 JJ12AT7 , V2 12AX7, V3 Electro Harmonix 12AY7 - better than option 1. still has a volume drop but better clarity.
Option 4 = V1 JJ 5751 (Cryoset), V2 12AX7, V3 Electro Harmonix 12AY7 - all the clarity, break at about 5 on the volume knob and enough gain to give drive
Favorite options1. Option 4 with 5751 with 12AY7 is my favorite from these options. Allows me to drive the tubes and maintain balanced tone overall. CSVeteran and NICK are obviously in the know on the 5751 tube selection.
2. Option 3 with 12AT7 and 12AY7 reduces gain significantly, so for a straight blues to clean country amp with lowest gain this would work for me. The only warning sign was the 12AT7 ran hotter than the other tubes, don't know what this would amount to but it did catch my attention.
3. Option 2 with two 12AY7s would work any day but I thought the others gave a little more tone character
Who knows I may try another option later but 5751-12AX7-12AY7 will be my set up for a while. (No preference for the Cryo tube, just found one for a decent price and wanted to see how it sounds) Next may try Tung Sols, JAN Philips, GE's or some other maker as well. All you Blues Deluxe owners these may work for you. I found that controlling volume by the guitar volume knob versus amp volume I could do more with this amp.
As always YMMV