Only other great choice not mentioned is in the same vein as Jtinn and Khaki8. The MO Valve KT77. It was designed as a premium replacement for the Mullard, which was enjoying much success back then.
Only problem is money, NOS KT77 are even more expensive than the Mullard, although there are things they do that are superior, even to the XF1 Brown Base series.
Only problem is money, NOS KT77 are even more expensive than the Mullard, although there are things they do that are superior, even to the XF1 Brown Base series.