(!!) (Best Overall Pair) 5Y4G Sylvania NOS 1951 (57-52/40 and 56-52/40) (rare)

1 pair) 5Y4G Sylvania NOS 1951 original boxes

1 tube) 57/40 and 52/40

1 tube) 56/40 and 52/40

(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