(!!!) (Recommended Pair) 407A Western Electric used/good 1963-1964 (35-38/26 and 36-38/26)

1 pair) 407A Western Electric used/good  "D" getter halo  in white boxes

1 tube) 35/26 and 38/26 (1964

1 tube) 36/26 and 38/26 (1963)

(407A=396A with a 20V filament)

(407B=premium grade 407A with higher Gm and higher plate current specs, 20V Filament)