Do I have to use a 12AX7EH to replace a 12AX7EH?

[SFMUSICMAN]

..or can I use different 12AX flavors for my 3 premap tubes?

[ampgeek]

Highly unlikely that you couldn't use different 12AX7 brands as well as many other non 12AX7 varieties.

What amp(s) are you considering rolling some different tubes into?

Cheers,
Dave O.

[SFMUSICMAN]

trying to troubleshoot an issue on a different thread. My Carr Rambler has some weird phantom noise on certain notes

[ampdoc1]

You won't hurt anything by trying different variants of the 12A*7 or the 5751. I've never used the "proper" tubes in any amp I've built (TWs, Dumbles and combinations of both). I trade 'em in and out until I have the least noise without losing the tone I want.

It takes about 15 minutes to find the best sound combination for YOU. Change tubes?,...do it again.

a'doc1