Woo Audio WA3 uses 6DJ8 and variants...the bigger Woos I think can take 6SN7 (WA22)
Darkvoice 336 I think can take 6SN7
Mapletree uses 12AX7
Edited by GrindingThud - 3/17/13 at 6:15pm
The Liquid Glass can run a ton of different tubes: 12AU7, 6DJ8, 6SN7, 12SN7, and many more.
Replaced the stock 12au7 in my HiFiMAN EF-5 amp with a clear top, side getter RCA. When I did an A/B, the RCA almost sounds too "tubey". Seems to lack definition but I'll check again. Also have a RFT EC882 on the way to compare.
Honestly, these tubes are GREAT. The more I listen, the closer I get to saying that they've had a larger impact than rolling between my various power and preamp tubes. The RFT's don't really add their own unique flavor like the various power and preamp tubes I have, they just straight up make things better.