Steve,
I love that the new amps get quages and I have always like the look of them. Would it be possible to add these to the older amps. Maybe do a DYI where you supply them and show how to hook them up for each amp. This way it would be up to the person to design how to house them, external box maybe. Also is there a way to hook these up so they are not in the signal path, or are they in the signal path? I think it would be great to get these hooked up on the older amps.
Thanks,
John