It was a custom tube set-up. He had 2 outputs and let me use one, since I hadn't brought a source. It was about 10 feet away and he just brought the RCAs over and we hooked them up. I just wasn't paying that much attention (yeah, I know, I should have been). We turned it on, tried it for a couple of minutes (not even one song), it was bad and I asked how many volts the amp was seeing, he said something like "oh, yeah, use this other one instead." Voila, back to good sound. Now that I think about it, I'm not sure I ever really heard him say anything about what the actual voltage was, I just assumed it was high. In any case, I guess the lesson with the Millenia is that it is pretty sensitive to what you feed it.
Yeah that's interesting, he must have done something for the voltage to be so high!