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6F8G RCA NOS round black plates no printing 1940's in white box (9.6ma and 9.8ma)

6F8G RCA NOS round black plates no printing 1940's in white box (9.6ma and 9.8ma)

$ 31.99

1 tube) 6F8G RCA NOS round black plates no printing 1940's in white box

1 section) 9.6ma Gm=2400

1 section) 9.8ma Gm=2500

 

 Tested on Amplitrex

Vplate=250V

Vgrid=-8V

Good Iplate = 7-10

Good Ma = 2400-2600

 

NOTES:

6F8G = (2) 6J5G inside 1 bulb

1 section has top cap for grid

1 section has internal grid connection

 

GE, Sylvania and Raytheon have mirror image parallel black plates


RCA and Ken Rad have staggered black ribbed plates

See more: vacuum tube
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