So... since this thread goes back in time about 47 years
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I was wondering what the current consensus is (if there is any) as to which Stax amps make the best upgrade over the E90. There are so many options.
Starting at the bottom of the range, we've got the SRM-252S, although historically there seems to be some disagreement as to whether this entry amp offers a considerable improvement over the E90.
Moving up a tad, there's the SRM-323S or 353X (I'm not sure what the difference is between the two).
There are good comments about the older SRM-1/MK2, although you need to be sure to get one of the models that has a pro bias port. Lots of positive mentions of this particular amp.
There's the SRM-T1 with vacuum tubes, although I've seen references to the fact that the appropriateness of this amp as an upgrade may be dependent upon the material you listen to (great for classical, jazz, acoustic; not so much for rock, metal, electronic).
Moving up in cost, you have the SRM-006 and SRM-007, although there are some reports that these aren't quite as good a match for the ESP-950 as the SRM-1/MK2.
I'm not sure where the SRM-727 falls in the range.
Are there any I've missed?
Most of what I listen to is hard rock and heavy metal, although I do also listen to pop and classical, although my tastes in the latter tend to the bombastic (Two Steps from Hell and the like).
Recommendations?