(!!) (Best Pair #3) 6GJ7=ECF801 Mullard UK branded RCA NOS 1975-1976
$ 18.99
1 pair) 6GJ7=ECF801 Mullard UK branded RCA NOS 1975-1976
1 tube) 85/60 and 86/60 (1975)
1 tube) 83/60 and 83/60 (1976)
Tested on B&K
See more: vacuum tube
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 (Best Pair #3) 6GJ7=ECF801 Mullard UK branded RCA NOS 1975-1976&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_a06f3bbc-ab9f-49fb-be57-ae77fb112ac1.jpg?v=1752559762){kind=link}
 (Best Pair #3) 6GJ7=ECF801 Mullard UK branded RCA NOS 1975-1976 "Pin It")