(!!!!) (Best Pair) 5R4GYB RCA NOS 1965 same date codes (50-54/40 and 50-55/40 x 2 tubes)
$ 59.99
1 pair) 5R4GYB RCA NOS (6539=1965) same date codes
1 tube) 50/40 and 54/40
1 tube) 52/40 and 54/40
See more: vacuum tube
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 (Best Pair) 5R4GYB RCA NOS 1965 same date codes (50-54/40 and 50-55/40 x 2 tubes)&Category=vacuum tube&ImageURL=http://cdn.shopify.com/s/files/1/0333/7633/products/1_130e5542-1ac2-4e33-91ea-31e39f470784.jpg?v=1602600138){kind=link}
 (Best Pair) 5R4GYB RCA NOS 1965 same date codes (50-54/40 and 50-55/40 x 2 tubes) "Pin It")