6922 vs. 6DJ8 vs,7308


Are these tubes interchangeable? I have all tubed systems, and the time has come for me to replace them with newer ones. Can I switch one from the other? What is their difference in terms of voltage use, quality, etc...
thanks to all of you who are techno scholars, you have been super helpful!!
umaasa
Hey thanks. It's part of a larger "guide" to online DIY tube info I have put together. If you find that list helpful you might find some of the rest helpful. Drop me an e-mail (You cant' send attachments thru Audiogon email system)with your address and I'll send ya the rest. It's convenient because it's a word doc with live links.

I remain,
If you read the tube manuals, there are differences in specs between the 3 types. Generally, for use in audio circuits, they are pretty interchangable. But not identical.

-Ed
Add this to Clueless' list: http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html#6DJ8
A circuit that requires a 7308 may not be able to use a 6DJ8. A circuit that can use a 6dj8 can use a 7308. They are electrically different.