(!!!!!) (Best Pair) E188CC=7308 Siemens Halske Germany NOS 1968-1969 (15.5/16.2ma and 15.2/16.8) (very low noise) (phono grade) (rare)
By Tube World
1 ultra-low noise pair) E188CC=7308 Siemens Halske Germany NOS gold pins "O" getter
1 tube) 15.5/16.2ma Gm=13,200/13,700 (G4-9D=1969)
1 tube) 15.2/16.8ma Gm=13,000/13,800 (G4-8L=1968)
Tested on Amplitrex
Vplate=90V
Vgrid=-1.2V
Good Ma range 12-15ma
Good Gm range 11,000 - 12,500
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VAC
 (Best Pair) E188CC=7308 Siemens Halske Germany NOS 1968-1969 (15.5/16.2ma and 15.2/16.8) (very low noise) (phono grade) (rare)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/3.jpg?v=1710992109){kind=link}
 (Best Pair) E188CC=7308 Siemens Halske Germany NOS 1968-1969 (15.5/16.2ma and 15.2/16.8) (very low noise) (phono grade) (rare) "Pin It")