Triode mode will give lower power output, but may give better sound quality.
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Twl is correct, Rick, triode power is usually half of the power otherwise available from the amp in its regular mode. If you're listening to small groups, small-scale works or, particularly, female vocals, I think you'll like the triode mode, it seems to have a more intimate quality, for lack of a better description, maybe because it is a little cleaner and clearer; but for a Mahler symphony I'd stick with ultralinear/pentode/whatever they call it on your amps, the extra power would be needed to give more of the illusion of a live performance. Try it out when you get them (or did they come in?).
It is my understanding that TAS is going to publish another review of the "new improved" ASL Hurricanes. I also heard that anyone who wants the "older version" as reviewed in TAS by Hp can order the amp that way. However, all new Hurricanes imported will have the new tubes, caps and triode switch. The importer tells me that this new version of the amps is much bettered in all areas that were good before except better! We'll see and listen when they come in. I, for one, am optimistic and feel relieved that it is not going to cost us anything--unlike some manufactures of yore seemingly foisted upon us. However, the "new improved amps" ought to have some change in nomenclature to designate this improved version, no?
Ahhhhh...here is where it gets interesting. From what I understand, Harry Pearson heard the version with the old cap's. The newer ones (oil and paper???) were reported to be not as good???? At least from some folks who were heard the two with HP. Another reviewer, however, reports that the ones with the newer caps are better? Uhmmmmmmmmmmm..........very interesting!
Anyway, I will wait and see what comes in. Maybe if we all (who ordered this baby) can compare if we have different versions?