They are similar, but not the same.
Lot's of misinformation on the WWW about ECC88/E88CC/E188CC (including this thread).
DeKay
6DJ8 vs. 6922?
Alright tube aficionados, are 6DJ8 and 6922 tubes inter-changeable? I would ask Roger Modjeski or Tim de Paravicini, but they're both dead.
Anyone care to name their favorites of each tube, for use in phono and/or line stage pre-amps?