Antique Sound Lab....Triode????

Triode mode will give lower power output, but may give better sound quality.

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?).

Not yet Russ...still waiting...(you've heard about the slow boat from........)????