(!!) USN-5687WA Tungsol black plates "U" getter used/good 1956 (27.5/28.5ma)
$ 39.99
1 low noise tube) USN-5687WA Tungsol black plates "U" getter used/good in white boxes 1956
27.5ma Gm=10,000
28.5ma Gm=10,200
Tested on Amplitrex
Good used Ma range 25-30
Good used Gm range 9000-11,000
Recommended for
Manley
Modwright
Audio Note
Ray Samuels
Ayon
Kondo
Mastersound
Audio Thrills
Loth
See more: vacuum tube
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 USN-5687WA Tungsol black plates "U" getter used/good 1956 (27.5/28.5ma)&Category=vacuum tube&ImageURL=http://cdn.shopify.com/s/files/1/0333/7633/products/1_6525c4d2-8fc6-4606-97cb-c7051935de1a.jpg?v=1609862407){kind=link}
 USN-5687WA Tungsol black plates "U" getter used/good 1956 (27.5/28.5ma) "Pin It")