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(!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1955 (108ma and 109ma) (one of the best sounding 6B4G ever made)

(!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1955 (108ma and 109ma) (one of the best sounding 6B4G ever made)

$ 129.99

1 matched pair) 6C4C=6B4G Russian NOS 1955 in white boxes - bases tight to glass

1 tube) 108ma Gm=6400 (1955) rattle inside base - dried glue particles

1 tube) 109ma Gm=7000 (1955) rattle inside base - dried glue particles

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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