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(!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1969 (86ma and 86.5ma) (these are some of the best sounding 6B4G ever made)

$ 86.88

1 matched pair) 6C4C=6B4G Russian NOS original boxes 1969

1 tube) 86.0ma Gm=6300 (1969) 

1 tube) 86.5ma Gm=6400 (1969) 

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)

 

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