6922 Tube Question

Are all 6922’s interchangeable?

yes

same same

Technically the 6922 is a ruggedized, mil grade designation.   Yes they are interchangeable but some 6dj8 won’t hold up in some newer CJ or any Audible Illusions preamps.    I had some nice 1964 Mazda 6dj8 that did not last that long in my CJ.    6922 Gold Lion I have yet to have one die .   Same goes for a Reflector 6n23eb, last a long time in my experience.

6dj8=ecc88=cv5358

6922=e88cc=cv2492=6n23p(Russian)=

6n11(Chinese)=cca=cv2493

7308=e188cc=6n23p-ev=cv4108

All in 6922 & 7308 family are interchangeable and if your circuit permits then and any of the 6dj8 ones.

6np1 (6np1-ev) is a different tube and most likely a modification in circuit is needed.

Ive used JJ and think they sounded good in my gear but it took buying 3 before finding one quiet enough for my preamp.   The other 2 are fine in my amp's driver position.

They are interchangeable but not the same entirely. As oddio points out, the 6922 and 7308 are special 10,000 hour versions of a 6DJ8. My experience is that you will get a shorter life with a 6DJ8, but perhaps not enough to warrant the difference in price. Many say they think the 6922 sounds better than the 6DJ8. I have less experience with the sound of the 7308.