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12BZ7/12AX7 vs. 5751

I have a Cary V12 with 12BZ7 tubes in the input. I read an article last night that suggest that the 5751 is interchangeable, just with less gain, and that it sounds significantly better. Has anyone used a 5751 in place of a 12BZ7, or for that matter a 12AX7, and could you comment on any differences/improvements in sound?

Thanks!
grimace
onhwy61's avatar
onhwy61
5,215 posts
 
I've read in several places that the 12bz7 is not a direct replacement for a 12ax7. I don't have the tech chops to fully understand why. You should check with Cary before making a change.
sounds_real_audio
1,005 posts
 

Perhaps new speakers would make a more substantial improvement.
grimace OP
624 posts
 
As a retailer, I'm sure you'd think so.
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