Question about Mic/Line preamp tubes

[rickfugue]

First post. Just got a cheap Behringer 2 channel Tube Ultra Gain preamp. I know it is far from the greatest thing I could have but from what I read it can be quite useful with tube swaping. The guy I bought it from switched one out with a JJ ECC83. I have laying around a Groove Tubes Mullard 12AX7 reissue and an ElectroHarmonix 12AX7. My question is are any of those agreeable swaps? What instrument(s) would these tubes work for better and what other tubes would you recommend? Which of those 3 would you prefer personally and why? Thanks in advance for any replies.

 

[MetalJonesy]

i use mullard reissues in my ART Pro MPA II, they sound great, much better than the stock chinese tubes! The EH tubes are good too, i believe they are a bit more brittle on the upper frequencies, i could be wrong here mind!

 

[rickfugue]

Awesome. Thanks for the reply.