(!!) (Best RCA Pair) 5Y4G RCA NOS 1946 (51-53/40 and 52-54/40) (rare) closely matched

1 pair) 5Y4G Sylvania NOS 1946 original boxes

1 tube) 51/40 and 53/40

1 tube) 52/40 and 54/40

(5Y4G/GT=5Y3GT with pin-out scrambled)

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