(!!) (PAIR) 18FX6A RCA NOS - 1 tube branded El Menco (44/28 and 42/28)
$ 13.99
1 pair) 18FX6A RCA NOS original boxes 1970 era same build
1 tube) 42/28 El Menco by RCA
1 tube) 44/28 RCA
Tested on TV-7
See more: vacuum tube
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 (PAIR) 18FX6A RCA NOS - 1 tube branded El Menco (44/28 and 42/28) "Pin It")