(!!) (BEST PAIR) 5Y4GA Sylvania NOS 1960's same date codes (54-59/40 and 53-58/40)

1 pair) 5Y4GA RCA NOS 1960's same date codes

1 tube) 54/40 and 59/40

1 tube) 53/40 and 58/40

5Y4GA=5Y4GT=5Y3GT with pinout scrambled

- Zenith 5S-250 1938
- Zenith 10S669 1942
- Philco 38-4 radio 1938
- Philco 37-650 1937
- Philco 38-62 1938