GarMan; Did you happen to get a look at Joeseph Esmillas site where he tests those transformers in a SE 2a3 circuit/ He seems to think that they perform better than specs, forgive me if this is redundant; you may have read that already; there is a link on Angelas site. I cannot speak from experience as regards matching SE with SS or Push-pull, as I have not heard all of those combinations. I have heard pretty good SS on the bass and PP tube upstairs, it seemed to work well but in the end I percieved some fatigue. I just became bored with it and to me that is a sign of some problem. When you talk about using amps at the frequencies they have the best response at; do you mean whether they are specifically designed with response contours? Some kind of designed in filters? However; I see no reason not to roll off the response on the high frequency amp, lots of vintage tube amps are rolled off below 60/70 hz. naturally anyway. If we are dealing with differing topologies what I have read is the output impedance; damping factor and amount of global feedback all contribute to a naturally ocurring contouring of the sound as a result of changes due to frequency and phase shifts. and that is where you run into trouble. But as I say I have not heard everything so maybe the effects of these phenomena are minimal. What I would like to examine relates to your post on the Pi site; and that is pre-amplifier eq. What have you tried along those lines? J.R.
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