1 low noise tube) 5691 RCA branded GE red base black plates NOS 1960”s a few vertical scratches on base – smeared printing on glass

1 section) 2.1ma Gm=1500

1 section) 2.3ma Gm=1600

best 6SL7GT sub

very smooth sound

low noise

good midrange detail

NOS Ma Range = 2-3ma

NOS Gm = 1500-1600

Recommended for

– Ampeg Heritage B-15
– Alessandro Itallian Greyhound jazz amp
– Alessandro Black and Tan 2005
– Almarro A318B
– Eddie Current