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Ok, so should be burned in nicely.
 
There are some theories around how mylar and similar interwinding materials (as used by Lundahl, if that is the OPT you are using) can need a fair bit of run in. This is more of an issue on eg input transformers where voltages are low so the dipoles in the dielectics don't get much of a kick.

-1db at 90k is a figure one can be proud of, but not actually all that surprising given the 6C33 and a solidly engineered design, which you obviously have. The 6C33 needs a fair bit of current from the driver stage, not to mention low impedance, so will be interested to hear how you are running the 6--oops, almost gave away the driver valve, if it's the one I think it is... Now if you'll excuse me, there are some more laundromats I have to trawl through.

cheers

Rerurn to Romy the Cat's Site