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Mcintosh C2600 preamp tube upgrade

I recently added the new McIntosh C2600 tube preamp to my system. It's paired up with the MC452 power amp along with Sonus Faber Elipsa speakers and Transparent interconnects/speaker cable.
I"m looking for some guidance with regard to upgrading the tubes in the C2600. Should I, or shouldn't I ? 
Also, what brand should I look for and where should I buy them. And finally, is this a diy upgrade or should I have it done at a audio shop? 
I appreciate any guidance all you audiophiles can offer
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ejr1953
918 posts
 
I have a C2500 and in that one, though the tubes are identified as "McIntosh", they are JJ tubes from the Czech Republic.

As my preamp is under warranty, I'll hold off on replacing the tubes, when I do, I've had several people point me to the Genalax Gold Lions as a great upgrade.
jetter
3,057 posts
 
Interesting, I did not know that there was a 12ax7a.  I use 12ax7's in my non Mc preamp.
ejr1953
918 posts
 
Jetter,
I found somewhere on the web that the "a" at the end of 12ax7a meant that it had a wound filament.  Not sure what that means to the sound quality.
jetter
3,057 posts
 
Hi ejr, I found the same.  In the short description I read, it mentioned the filament helped reduce microphonics.  I am not that experienced as neither my tube amp or pre has ever suffered from microphonics (that I noticed anyway), but I would have never guessed the 12ax7 in general would be prone to it. 
ei001h
290 posts
 
I know this is off topic, but has anyone compared c2600 with c52 as paired with mc452? How much difference is there? Is it clearly audible? Which would you recommend for classical music with VA mozart speakers? 
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