Hiendmmoe,
I previously owned the 5.5 and I tried a few differant com-
binations. What I ended up with was: four premium Mullard
6201's in the 12AT7 positions, and two Amperex Bugle Boy
12AX7's.
I did try Mullard CV 4004 in the 12AX7 position which were
very nice, but I preferred the Bugle Boys as they are more
more foreward and dynamic.
Once you try premium tubes in your 5.5 you will probobly
never go back to the stock tubes.
If you only want to replace one pair as in your suggestion,
it would be the 12AX7's. They are the front pair (left and
right).
I previously owned the 5.5 and I tried a few differant com-
binations. What I ended up with was: four premium Mullard
6201's in the 12AT7 positions, and two Amperex Bugle Boy
12AX7's.
I did try Mullard CV 4004 in the 12AX7 position which were
very nice, but I preferred the Bugle Boys as they are more
more foreward and dynamic.
Once you try premium tubes in your 5.5 you will probobly
never go back to the stock tubes.
If you only want to replace one pair as in your suggestion,
it would be the 12AX7's. They are the front pair (left and
right).