I have tried many types of 6DJ8, this is part of my list:
E188CC Philips Miniwatt / 7308
E88CC (6DJ8, 6922, ECC 88) Telefunken
ECC88 EI
PCC88 EI Yugoslavia from late 60s
PCC88 Tungsram from 70s (1971)
And this is the right order to my point of view ...





