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MC275 Tube Rolling...

I would love to roll some tubes with my MC275 (the current production version V) It is highly appreciated if all you who are experienced drop a few lines... I would like to know about the tubes that you have ever rolled on this machine from the beginning until the end, the sound characteristic for the each of them and the one which you settled down with and of course... why the choice... Yeah, I am clueless of what tube to get since there are so many out there... All your inputs will be extremely valuable to me. Thank You So Much!
infinity_audio
infinity_audio OP
183 posts
 
Made a decision that I am going to give the Genalex a try. Still want to know whats good to roll for the 12 type tubes...
infinity_audio OP
183 posts
 
I also realized that on the chassis it is printed 12ax7a. What is the difference between the 12AX7 and the 12AX7A? Will it be okay if I use a 12AX7 instead of a 12AX7A?
magnumpi205
504 posts
 
Genelexs are in three of my amps. Great tubes. Reasonable price.
Amperex ecc83 are the best of the bunch for sound and longevity. Also,can use-12ax7,12ax7a,7025,7025a,6681,ecc803,ecc803s, plus others.
Telefunken ecc81, slightly dark but very clear and clean. Also can use-12at7,12at7wa,12at7wb,ecc801s etc.
These tubes range from common use tubes to commercial to military grade.
You can pretty much tune amp to your ear.
lapierre
547 posts
 
Mullards, Telefunken and Amperex are the most common used for 12ax7 and 12ax7a in preamps and amps. Some tubes have higher gain or low microphonics with warmer or darker sound.

Magnumpi205 described it pretty well.
infinity_audio OP
183 posts
 
Do we really need to follow Mac's instruction for using 12AX7A? or the regular 12AX& and 5751 will work. I am talking about the v1, v2 and v5 position.

If I am using unbalanced input, is v1 in use? Will changing the v1 tube affect the sound more or the v2 and v5 changes the sound more?
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