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(!!!!) (Best Matched Quad) 6C4C=6B4G Russian NOS 1964-1969 (91ma, 91.8ma, 92.0ma, 92.8ma) (1 QUAD) (highly recommended)

$ 164.99

1 matched quad) 6C4C=6B4G Russian NOS dual getters - large getter flash on each tube

1 tube) 91.0ma Gm=6500 (1964) slight rattle inside base - dried glue particles

1 tube) 91.8ma Gm=6350 (1969) no rattle

1 tube) 92.0ma Gm=6450 (1969) slight rattle inside base - dried glue particles

1 tube) 92.8ma Gm=6500 (1969) no ratlle

 

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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