(!!!) (Recommended RCA Pair) 6X4 RCA NOS 1960's (51-52/40 and 51-53/40 x 2 tubes)
$ 29.99
1 pair) 6X4 RCA NOS D getter 1960's same date codes (MX)
1 tube) 51/40 and 52/40
1 tube) 51/40 and 53/40
See more: vacuum tube
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 (Recommended RCA Pair) 6X4 RCA NOS 1960's (51-52/40 and 51-53/40 x 2 tubes)&Category=vacuum tube&ImageURL=http://cdn.shopify.com/s/files/1/0333/7633/products/1_21f5b8de-29ec-4e33-9aa4-fca5ba8bb46f.jpg?v=1628600144){kind=link}
 (Recommended RCA Pair) 6X4 RCA NOS 1960's (51-52/40 and 51-53/40 x 2 tubes) "Pin It")