11-15-07: Springbok10
The solution may well be a Differential pre-amp, such as the Supratek Cabernet Dual, with different outputs and tubes to LF and HF. Yet more $$.........
Problem with the 12AU7 on the outside means you cant use the higher gain 6DJ8 tube with it, so there is no way of getting differential gain.
I don't know what that means. Are you talking about not being able to use the 12AU7 and the 6922 in the same amp, but in different positions? This can be done. If you're talking about not being able to use 12AU7 and 6922 in different amps because the gain will be inherently different, then this is true. I thought that was your goal?
Why not use a tubed crossover like a Marchand unit? I believe the gain can be infinitely adjusted this way.
I'm using a VAC Musicblock 160 monoblocks with an Atma-Sphere MP-1. I have Atma-Sphere M-60 amps on the way for comparison.