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I challenge you to publish your measurents of that rolloff!

The least you can do before you write unfounded "facts" against someone's statement is check whether that someone has done his/her homework!

In engineering, we do things FOR A REASON. At least I do. Even if it's for a hobby!

I did look into the other dual-triode tubes, in the context of the simplest possible design, using a single 9-pin socket. many were rejected on the basis of low gain in a practical circuit.
Do not "bundle" the 12AT7 with a 12AU7 or a 12AX7. The AU7's mu is too low for this application and the AX7's Rp would indeed cause an undesired rolloff.
I developed several designs, based on a 5687 and 12B4A tubes, but all these require a second socket. I would have proceeded to test them (and I might do it some time) but for the life of me I can't justify it. The sonic qualities of the zero feedback triode front-end are just too good. I can hear the next question: what's his reference... The nay-sayers would probably just go on and on, but here is a sane proposition... Instead of analyzing what's for you is a "paper design", why won't you build it and answer your own question "what does this mod sound like ? "
It would take less time than arguing whether it should or shouldn't sound good. Worst case, in the end you'll have two boards that you can use to try your other proposals rather than "throw them" off your head.
Then you can tell me the rolloff frequency... But fasten your seat belt first... The result might floor you!
But it shouldn't. You're the one that said that you must measure rather than rely on specs, otherwise it's a heresy, right?!
Don't waste further time on unfounded statements - just do it! (TM - Nike...)
Don't trust my reference amps? Put this one against yours in a competent system with fair component matching (for this class of an amp). Only then can you voice a **specific** opinion regarding the sonic qualities of **this** amp.
You didn't hear it. I did!!!



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