(!!!!!) (Recommended Single) JAN-5691 Sylvania black plates NOS 1979 (2.2/2.4mA (Best 6SL7GT sub) (same internals as 5691 red base)
$129.99
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1 low noise tube) JAN-5691 Sylvania black plates NOS 1979 2.2mA Gm=1500 2.4mA Gm=1700 - very good detail - low noise - reference tube Good mA range 2.0mA+ Good 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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