Is it a mistake, or are they interchangeable? (Algemeen)

door edison , Aveiro - PORTUGAL, 15.03.2022, 01:12 (984 dagen geleden) @ Robert Gribnau

Never saw that before.

Misprint or not, I would think that an EBC90 on a spot of an EBC91, and viceverca, will function in most, if not all cases. Only the triode sections differ a bit, but not much.

Greetings,
Robert

Hallo Robert.

I have some valves with a marking error, but with two references.... I've never seen them either.
Like EBC90, it works fine.
Haven't tested as EBC91 yet.

--
From PORTUGAL, with regards
Carlos