(!!!!) (Best Pair) 5R4GB GE black base NOS (48-51/40 and 50-52/40 x 2 tubes)
$ 37.99
1 pair) 5R4GB GE black base NOS
1 tube) 48/40 and 51/40
1 tube) 50/40 and 52/40
5R4GB black base = 5R4GYB with brown base
See more: vacuum tube
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 (Best Pair) 5R4GB GE black base NOS (48-51/40 and 50-52/40 x 2 tubes)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_d59bf399-571d-4ba7-b81e-9f9a4307f27b.jpg?v=1741391564){kind=link}
 (Best Pair) 5R4GB GE black base NOS (48-51/40 and 50-52/40 x 2 tubes) "Pin It")