Rolled in the Sophia 274B in the WA6 Gen 1 and with the 6SN7 adapters and Sophia 6SN7............ it doesn't fit.  So.......... have my choice of Sophia 274B or the pair of Sophia 6SN7 with adapters. To my ears, the Sophia 274B with a pair of matched Sylvania 6EW7s sounds better than the Sophia 6SN7s with the Sovtek 5U4G. Still have to break-in the JAN Philips 5U4G to compare, but the Sophia 274B is the best thus far. Also have a pair of Westinghouse 6DE7s to play with and some Sylvania (2 flavors) & RCA (3 flavors) 6SN7s and a couple of others to play with. Just can't go Sophia all the way. Really do like the sound the WA6 provides. 
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Glenn...
Canton Reference 9 Clearaudio SM Pro Focal Bathys JLA 10" Dominion Kuzma Stabi S w/MC & MM Magnepan 1,7i McIntosh MA8950 & MR88 Oppo 203 Roon Nucleus Rose Hifi RS150B Shunyata Gemini-4 Sony ST-A6B, TA-F6B, ST-J75 & PS-X75 Sorane SA1.2 & TA-1L Stillpoints LP1v2 WW Pt, Au & Ag
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