(!!!) (Recommended Pair) 5881 Sylvania black base NOS 1979 same build (73.2ma and 74ma)
By Tube World
$ 139.99
1 Matched Pair) 5881 Sylvania black base NOS 1979 same build
1 tube) 73.2ma Gm=6100 (Sylvania JAN 1979) grid heatsink - see photo
1 tube) 74.0ma Gm=6250 (Sylvania branded RCA 1979)
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 (Recommended Pair) 5881 Sylvania black base NOS 1979 same build (73.2ma and 74ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_9dfc5e2f-7358-43bb-929c-9964c9375127.jpg?v=1684988168){kind=link}
 (Recommended Pair) 5881 Sylvania black base NOS 1979 same build (73.2ma and 74ma) "Pin It")