(!!!!) (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) "Pin It")
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