(!!!) (Recommended Pair) 5881 Sylvania black base NOS 1970's same build (65ma and 67ma)
By Tube World
$ 139.99
1 Matched Pair) 5881 Sylvania black base NOS 1970's same build in white boxes
1 tube) 65ma Gm=6200 (Sylvania branded GE 1973)
1 tube) 67ma Gm=5700 (Sylvania 1970's)
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 (Recommended Pair) 5881 Sylvania black base NOS 1970's same build (65ma and 67ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_ffaecae3-6d7d-482c-b9b8-688ad21b02e6.jpg?v=1685485220){kind=link}
 (Recommended Pair) 5881 Sylvania black base NOS 1970's same build (65ma and 67ma) "Pin It")