3S4 RCA NOS U getter 1950's (1 pair)
By Tube World
$ 17.99
1 pair $16) 3S4 RCA NOS 1960's same build
1 tube) 60/38 RCA red printing "U" getter
1 tube) 59/38 RCA rebranded Raytheon no getter halo
1 tube) 60/38 RCA red printing "U" getter
1 tube) 59/38 RCA rebranded Raytheon no getter halo
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