Power tubes for a Mark 3

[Goldtop]

Looking for a good source for tubes for a Mark III. Would like to get a pair of the SED 6L6s and SED EL34s. I have tried using Dougs Tubes and The Tube Store for power tubes with not such good luck. With Mesas fixed Bias it's picky on power tubes. Any suggestions. I've used Mesas 6L6 440s but, I don't think there as good as the old Mesa 6L6 454s.

 

[dodger916]

What do you mean by "not such good luck"? I got winged C's and a new Mullard 12at7 from Doug's that I really like.