Tmcroy, your tube xover (Marchand X126) + Single Ended + Bi-amp to push-pull sounds like a winner. But i don't choose my drivers by their db level. I look for what i believe to be superior drivers. Then i look for an appropriate amp. (i'm a Jadis fan). What are the Jadis?... Twl seems in speakers and amps you have a trade off in every choice you make....What i need is one example of Single Ended, Triode, Push Pull, SET. What i can also do is look at all the tube manufactures web sites and there should be descriptions of their amps, i should have something going then.