(!!!!) (Best Pair) 5R4GB GE black base NOS 1981 (51-53/40 and 51-54/40 x 2 tubes)
$ 39.99
1 pair) 5R4GB GE black base NOS 1981
1 tube) 51/40 and 53/40 (MS)
1 tube) 51/40 and 54/40 (NS)
5R4GB black base = 5R4GYB with brown base
See more: vacuum tube
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 (Best Pair) 5R4GB GE black base NOS 1981 (51-53/40 and 51-54/40 x 2 tubes)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_45bc0bcf-3500-419b-8795-8b7ef68c4476.jpg?v=1684847701){kind=link}
 (Best Pair) 5R4GB GE black base NOS 1981 (51-53/40 and 51-54/40 x 2 tubes) "Pin It")