(!) (BEST PAIR) 5BZ7=5BQ7A GE gray plates NOS 1971 (10.8/10.6ma and 10/9.3ma)

1 pair) 5BZ7=5BQ7A GE gray plates NOS 1971 “”O”” getter halo

1 tube) 10.8/10.6ma and Gm=7700/7600

1 tube) 10/9.3ma and Gm=7400/7000

sub for a 6BK7 or 6BQ7A

dual-triode