(!!) (BEST PAIR) 5Y4GA RCA NOS 1969 same date codes (52-56/40 and 52-57/40)

1 pair) 5Y4GA RCA NOS 1969 (CS) same date codes

1 tube) 52/40 and 56/40

1 tube) 52/40 and 57/40

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