Got a yba 200 about a month ago from the classifieds here. Upon first play, I loved it, but when playing with a full band - I found what many here had already known, it distorts way too early. I replaced both preamp tubes with EH 12ay7 - picking the ay because of the low gain when compared to the stock ax7. While this did allow me to turn it up more, and the distortion is much more smooth, i am still not getting the clean volume i require. So after a long introduction, my question is - are these the right preamp tubes to use? Did the reduced gain cut output? I am considering KT88s for the power tubes - any brand in particular i should look at? EHs OK? or should i look for something else? YBA experts - what is the final word on rebaising with KT88s? I know this amp is self biasing, but does that apply to the 88s? Sorry for so many question - I really want to make this amp work. I cant afford to spend much more than i did on this amp, and I am not interested in carrying much more weight. Thanks in Advance.