(!!!) (Good Value Pair) 6SL7GT Sylvania gray round plates chrome top used/good 1949-1954 (2.3/1.9ma and 2.4/2.1ma)

1 low noise pair) 6SL7GT Sylvania gray round plates chrome top used/good in WB
1 tube) 2.3/1.9ma Gm=1400/1300 (1949) Sylvania green
1 tube) 2.4/2.1ma Gm=1600/1500 (1954) branded PHILCO - red

Good current (mA) range = 2.0-2.5ma
Good Gm = 1500 

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