I tried RCA Clear Tops, EH, and Radiotechnique(cryoed) before settling on Mullards as the ones that sounded best to me...in my system. It's really a matter of personal preference when changing tubes.
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i've experienced with a few different tubes in my unico...
this is a must!take out those cheap jj 12au7's out of there
and replace with a good quality tube! the sonic improvement
will not be slight..ITS HUUUGE.
i tried new old stock military grade mullards cv-4003 and i
was not impressed with the sound,very sweet mids but lacked
overall control in the bass region and the highs were not
extended and rather veiled.
phillips miniwatts ecc82! very good tubes if you can get your hands on them,made in holland ,these solved the problems that the mullards had..tighter bass with very nice
top range extension.i think amperex bugle boys would sound
very similar to the minniwatts being produces in the same
plant i think!(?)
lastly telefunken ecc82 tubes,very epensive if you can find a good matched pair these are the deal! amazing trough the whole spectrum,find berlin production of these
from the 50's or 60's and that will be as good as an
12au7 tube gets.
find a good tube dealer that is reliable..i cannot stress
this point enough. since the amount of vintage tubes is slowly running low and hard to find,theyre have been recent
complaints of counterfit tubes on the market!
hope this helps and happy listening!