[Arran]

Since this one obscure eye tube uses a sort of bar graph display, and dual triodes, I was just thinking that maybe an adapter could be made using a pair of EM83s (Soviet version 6E3p of course), but the filament current for each would be 270 ma so slightly more load on the transformer . Then again the EM83 has two triodes inside so you may not need the second tube unless you just want the dual bars side by side, not sure about the 6E3p. From what I was reading about the 6AD6 or 6AF6 in the few radios that used them they drove the eye tube from the plate of the IF amplifier rather then employing another tube. However the filament current of both tubes is only 150 ma, which was why they were also used in some Belmont built Airline AC/DC sets, so you could add a dual triode tube to drive it as the 6G-E12 uses a 300 ma filament, still an engineering project but not impossible. You could still go the 6AL7 route maybe, but then you would only have one operable shadow, I have to go that route when replacing a Rogers 6X6 with a 1629 since the prior has two shadows and the latter only one.
Regards
Arran