I had the same exact thoughts you did about the 24 volt tubes... which is why I opened it up and started reading the thread. There were several sample cicuits in the thread. One using a 6dj8 and the other a 6c45pi...
looked so simple... maybe worht building just to prove that it's a crazy idea. If you want I will get the url for you... it was over on the tube forum at www.diyaudio.com.

I went over and checked out the Pi speaks. Did you get the kit and your building the cabinets? The kit price seemed very, very good. Wayne must have some purchasing power! It's a corner horn, right?

My uncle has a (think it is) 67 GTO that he bought brand new when he was like 21 years old. Pristine condition sitting in his garage.

Yeah, about the cars and audio going together.... Lloyld Walker of Walker Audio had a really radical 4.6 V8 that was breathed on pretty well... and could just plain scare ya...

msl