(!!!) (Recommended Pair) 6BK7B Tungsol black plates NOS "O" getter 1960 era (9.5/12ma and 9.8/10.5ma)
$49.99
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1 pair) 6BK7B Tungsol black plates NOS "O" getter 1960's1 tube) 9.5/12.0ma Gm=6200/72001 tube) 9.8/10.5ma Gm=6200/6600 (1962) Matched on Amplitrex Good Ma range 6-8ma Good Gm = 5000-6000 (also see 6BZ7 and 6BQ7A, sub for 6N1, 6N1P)- Modwright Transporter- Schiit Lyr amp 2011- Don Allen- Donald North Audio (DNA) Stratus
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