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(!!!) (~ Best Pair ~) 407A Western Electric NOS 1961 same date codes (46-48/26 and 47-51/26)

(!!!) (~ Best Pair ~) 407A Western Electric NOS 1961 same date codes (46-48/26 and 47-51/26)

$ 59.99

1 tube) 407A Western Electric NOS "D" getter halo (6139=1961) same date codes

1 tube) 46/26 and 48/26

1 tube) 47/26 and 51/26

 

Matched on TV-7

 

407A=396A with a 20V filament


407B=premium grade 407A with higher Gm and higher plate current specs

 

407A and 407B have 20V Filament

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