(!!) (1 Pair) 6SH7GT Raytheon 1940's-1950's NOS rebranded in 1970 (8.6ma and 9.0ma)

1 Pair) 6SH7GT Raytheon 1940's-1950's NOS rebranded in 1970 in white boxes 
        surface oxidation on each base
1 tube) 8.6ma Gm=4600
1 tube) 9.0ma Gm=4600