I took my champ I built a little while back to the local music shop today because one of the guys there just bought a 1961 Tweed champ that is all original except the cord. So we put them side-by-side and a b pedal and gave them some time to play together today. I've got to say I was a lot more proud of mine until I heard that vintage speaker, it still has the goods. I have a ceramic Jensen in mine that I got a great deal on at the time, but I didn't realize how grainy it sounds until I heard the Vintage one beside it.... Smooth as glass and louder. I forgot my multimeter and so I wasn't able to check his voltages. I kept mine low at 330v or so, but there is another secondary that I could bump it up to probably 370 if I wanted. Anyway after enough of that, we plugged mine into a 4x12 cabinet. Rock and roll!