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MB3045 KT88 Bias Levels

Posted by geraldm121 on June 18, 2009 at 08:00:23:
Earlier this week I posted to the Amp/Preamp Asylum about Changing my Luxman MB3045 from 8045 outputs to KT88's. Thanks to all that responded. The change over was not a problem as the KT 88's are in and running along with 6CG7's replacing the NEC6240 drivers. The Luxman modification bulletin suggests biasing at .5v. My issue is that the amp when Biased to .5v(after the modification) sounds rather bright and sibilant which usually indicates to me it is under biased. The 8045's suggested bias was .75v and while I realize the KT88's cannot take this level how far can I go with the bias level without running in to issues? Thanks in advance for your help. Oh, and Mike Samra I was going to call you later what time is good for you?

Jerry