Ok, so I'm trying to learn about tube amps, how they work, how to work on them, all that jazz. I scored Gerald Weber's second book and was reading it last night. There's a paragraph in there about how the speaker outputs on old SVTs are deliberately wired backwards so that guys wouldn't blow speakers when using only one cabinet. He says when you plug in one cabinet, it's actually running off the 2-ohm tap, and making less power in the process. He says to get full power at 4 ohms, plug in a dummy jack into the external speaker output. This makes no sense to me. I can understand running a 4-ohm cab off the 2-ohm tap to make less power and save speakers that are under warranty. But if plugging in two cables uses the 4-ohm transformer tap, and you're using 2 4-ohm cabs, isn't that a recipe for destruction?