Saki70, So far as I know the Two will not take EL84's. Re comparisons between the Five and Two, the units are very similar in design with a few differences, one being the absence of negative feed back in the Five and I have been told that sonically they are similar. Rarl has both and can comment on the differences if any, however I don't believe he uses the Three. Obviously choice of pre-amp can affect the sound of the amp. If the only difference between the One and the Two is the speed, taughtness of the bass, and resolution, as well as the different tubes and their individual sounds, the Two would be an excellent unit. I haven't heard from anyone who has both the Two and the 3/5 combo. You might call Kevin Deal and discuss this with him. He obviously has total knowledge of these units.
Regarding low level performance, my listening levels usually average about 80 db +/- 3db, and I note no loss or improvement for that matter, with the PL amps with lower or higher volume.
Regarding low level performance, my listening levels usually average about 80 db +/- 3db, and I note no loss or improvement for that matter, with the PL amps with lower or higher volume.