The emission labs tubes are a higher power tube. In fact some people say that they are really not a 45 tube at all and are more like a 2a3.... One reason a lot of people like them, is that they probably can use the extra power, with their less sensitive speakers. I for one do not desire more power and was not impressed at all with the Emission Labs Tubes. I sent them back immediately.
According to the Builder of my Korneff Clones, I can use 2a3 tubes in my Amp without a circuit change. He tried them when he had the amps and admitted a lot of the '45 magic' was gone with the 2a3 tubes... He had Altec Valencia Speakers and he was impressed with the extra power of the 2a3 tubes.... I won't ever need to go there with my 115db Horns.
