(!!!) (Recommended Pair) 866A GE NOS 1971 graphite lifted off top plate (56/40 and 57/40)
$ 109.99
1 matched pair) 866A GE NOS 1971 graphite burned/flaked off top cap when aged in tube tester - this is common when tubes are being used - graphite burns off top plate
1 tube) 56/40
1 tube) 57/40 - some graphite material at bottom of tube
See more: vacuum tube
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 (Recommended Pair) 866A GE NOS 1971 graphite lifted off top plate (56/40 and 57/40)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/3_1_85a922f3-92e8-4407-983a-9e0c5d8effb4.jpg?v=1769459086){kind=link}
 (Recommended Pair) 866A GE NOS 1971 graphite lifted off top plate (56/40 and 57/40) "Pin It")