I'm looking for a matched pair of Mullard Mc1's for my Pathos InPol Heritage integrated. Any direction would be appreciated.
Brent Jessie claims to have a few NOS pairs - prices are what you would expect. See:
I've been satisfied with my tube purchases from him in the past.
There are also a couple of used pairs on ebay, which is always a crap shoot. I stopped looking for these and the 50's long plate Amperex for my Pathos TT when the pricess got crazy. The relatively affordable NOS tubes that sound great (and similar to their European counterparts) in my TT are the 1950's Sylvania long black plate 12AX7's which I've stockpiled. Unfortunately they are becoming rare now but not nearly as pricey as the Amperex and Mullard.