(!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1958-1967 (79ma and 85ma) (one of the best sounding 6B4G ever made)

1 matched pair) 6C4C=6B4G Russian NOS 1958-1967 in white boxes 1 tube) 85ma Gm=6500 (1958) 1 tube) 79ma Gm=6300 (1967) Internal construction superior to American made 6B4G   Test Data: Vplate=225V Vgrid=-30V GOOD NOS Ma range 70-90ma GOOD NOS Gm = 5200   Recommended for (6B4G=6.3V filament)(6B4G is electrically equivalent to 6A3, but 6A3 has UX-4 pin base and 6B4G has 8 pin octal base)(The best sounding 6B4G are 1940's-1950's: Ken Rad, Tungsol, Sylvania, Raytheon)