(!) (BEST PAIR) 0C3 RCA NOS – 1 tube branded GE 1959 and 1962 (1 pair) (argon)

1 pair) 0C3 RCA NOS same build (argon)

1) RCA branded GE 1959

1) RCA 1962

tubes plugged into octal sockets for picture

– Tube Research Dude preamp
– Decware

(105V @ 5-30ma)