(!!!!) (Good Value Pair) 6SN7GTB Sylvania chrome top used/good 1957 (7.4/8.5ma and 7.3/8.4ma) (Schiit Freya, Rogue, Modwright OPPO)1 low noise pair) 6SN7GTB Sylvania chrome top used good 1955 1957 in white boxes 1 tube) 7. 4 8. 5ma Gm=2400 2600 (1957) Sylvania 1 tube) 7. 3 8. 4ma Gm=2400 2400 (1957) Rauland by Sylvania Matched on Amplitrex Vplate=250V Vgrid= 8V Good NOS Ma range 7 10ma Good NOS Gm = 2400 2600 best for: Modwright Oppo 105D Grant Fidelity (Yaqin) B 283 mkII tube buffer Valvet Audio preamp Schiit Freya Singlepower PPX3 SLAM Aesthetix Calypso CJ MV55 Cary SLP 05