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This can be good for harp, because you generally want to drive the amp into distortion to get your blues tone, but don’t want to play loud enough to cause feedback into the microphone.
Some Experiments with Different 12AX7 Brands I was testing a customer’s Blues Junior that I’d just finished modding and thought it sounded a little dull.
It has 60 percent of the gain of a 12AX7, but it’s designed with heavier plates and lower internal resistance to push large amounts of current.The 12AY7 is also very similar to the 12AX7, but has less than half the gain. A Blues Junior with a 12AY7 in V1 will produce just as loud a clean tone as one with a 12AX7, but at 7 on the volume knob, while the 12AX7 will produce maximum clean at about 4.It’s the preamp tube that Fender used in classic amplifiers such as the Tweed Deluxe, many Champs, and the revered 57 Twin. After that, the 12AX7 starts producing serious amounts of distortion. The 5751 or 12AY7 don’t give you any more clean headroom.Fender does provide some guidance for dating their modern amps....that information can be found here."All Fender amplifiers manufactured from 1990 to the present include a date code, printed on the quality assurance (QA) sticker on the back of the amp chassis.