I have tried a variety of 6550 varients in my CJ PR 8A's from EH, Svetlana, NOS Tungsols and others and for the price, sound, and reliability the SED Winged Cs are my tube of choice as of a lot of other Audiogoners.
In my post above I mentioned my preference for SED Winged C 6550 tubes in my CJ Premier 8A's. However FYI I had already scheduled to have my PR 8's converted to the XS triode version utilizing EL 34's tubes, for the reasons you mentioned in your post. I have 4 quads of original NOS TESLA EL 34s on hand which I aquired for the conversion. I am very anxious to hear the change. I am also having Teflon V-Caps installed while I am getting the XS conversion done.
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