you might try just changing the drivers lst. i use svetlana 6550c's. i had sovtek 6922's which i traded out for tesla e88cc's. the tesla's are not as cold sounding as the 6922's. by the way i have the 6h23's in my pre amp - not that much difference between them and the sovtek 6922 (nos sovteks that is - the new sovteks define cold!). in my application i found the svetlana kt88s to be very clean in the highs/mid range but i found the bass a little lightweight. have fun!
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