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12AX7 tubes for Music Reference RM-10

I looking to replace the 12AX7 tubes in RM-10 amp. Looking at the manual it says something about "V1" being grade AB and "V2" being BA. Below is a quote from them:
" Note that V1 is a RAM grade AB (section 1 selected for low noise) and V2 is grade BA (section 2 low noise). It is essential to have a grade A section as the first amplifier to achieve the very low noise of which the RM-10 is capable."
The question is: do I need some type of special 12AX7 tube? Do they have to be matched? Balanced? etc...
Any feedback will be greatly appreciated, thanks in adavance to everyone.
jmcp60

Showing 2 responses by tonykay

tonykay
856 posts
 
I decided to try tubes in a small way. I boughta tube-driven Stax headphone system. Yes, I like it a lot. So, my
next step will be to buy a McIntosh 275 MkV. If it sounds as good as the Stax, I'll be a convert.
tonykay
856 posts
 
I really like the sound of tubes but after reading this
thread, I think it sounds too complicated to buy used tube
gear. Thanks for stemming my tube neurosis even before it
gets started.
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