(!!!!!) (Recommended Pair) JAN-5691 Sylvania black plates NOS 1979 (1.9/1.9mA and 1.9/2.1mA) (Best 6SL7GT sub) (same internals as 5691 red base) 1-3% matched
$189.99
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1 low noise pair) JAN-5691 Sylvania black plates NOS 1979 1-3% matched 1 tube) 1.9/1.9mA and Gm=1400/1500 1 tube) 1.9/2.1mA and Gm=1400/1500 - very good detail - low noise - reference tube NOS mA range 2.0mA+ NOS Gm range 1500+ Recommended for - Ampeg Heritage B-15 - Alessandro Itallian Greyhound jazz amp- Alessandro Black and Tan 2005- Almarro A318B- Eddie Current
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