(!!) (BEST PAIR) 6BQ6GTB=6CU6 Sylvania NOS 1960”s (54ma and 54.5ma)

1 pair) JAN-CHS-6BQ6GTB=6CU6 Sylvania NOS 1960”s

1 tube) 54.0ma Gm=5800

1 tube) 54.5ma Gm=5800

Good Good = 50ma

Good Gm = 5200+