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Questions about tubes and gear that glows. FAQ

Try a 5r4 rectifier

It should help by virtue of its higher voltage drop resulting in a little less voltage but i still think you nee to make changes to have the B+ below 400vdc. the GE tube manual for the 6V6GT shows recommended voltages of 285vdc in pp class ab. Of course the amp makers would "ignore" these recommendations and push the tubes to very limit. It is interesting to note that the characteristic curves in the GE manual show no points pass 400vdc!
This is not the case for 6V6GTA tubes for which the characteristic curves are plootted to 500vdc. So, you can try the GTA or 7408 tubes which have higher ratings and maybe ok in your unit but seriously, your B+ needs to be lowered with a dropping resistor or choke or a bucking transformer.
6V6GT is not designed for 450vdc plate voltages.

Edits: 06/08/17

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