I have ML 2.1's and have used many NOS tubes including Telefunken and Mullard. The latter was not my taste BUT "wow" to the Telefunken 12AX7. Presently I have circa 1965 with a rib plate. Each tube was ~$350 but bear in mind that this is the first tube the signal sees and IMO is the only tube worth rolling in the amp.
As for AC PC's I use all Nordost Valhalla here and throughout my system.
BTW be certain to change the 6N6P tube on that amp yearly as recommended by Vladimir.
As for AC PC's I use all Nordost Valhalla here and throughout my system.
BTW be certain to change the 6N6P tube on that amp yearly as recommended by Vladimir.