(!!!!!) (Best Overall Pair) E188CC=7308 Siemens Halske Germany NOS 1968 (16.8/18.0ma and 16.5/17.4) (very low noise) (phono grade) (rare)
1 ultra-low noise pair) E188CC=7308 Siemens Halske Germany NOS gold pins "O" getter - partially faded printing on both tubes from tubes rubbing inside boxes
1 tube) 16.8/18.0ma Gm=14,000/14,900 (G4-8L=1968)
1 tube) 16.5/17.4ma Gm=14,500/14,300 (G4-8L=1968)
Tested on Amplitrex
Vplate=90V
Vgrid=-1.2V
Good Ma range 12-15ma
Good Gm range 11,000 - 12,500
Recommended for:
Lampizator Level 4 DAC
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Audio Research PH3 SE
Audio Research LS15
Cary V12R amp
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Herron VTSP-2 preamp
Musical Fidelity X-CANS
AIR TIGHT ATE-2
Zanden
Aesthetix phono and pre-amp
Lamm M2.2s
Pathos
Synthesis Audio Italy Magnum 100 (2008)
CAT SL-1 Signature (phono and linestage)
Tube mic preamps
Monarchy hybrid amp
Klimo Merlino Gold Plus (Italy)
Earmax pro
BHSE
VAC
 (Best Overall Pair) E188CC=7308 Siemens Halske Germany NOS 1968 (16.8/18.0ma and 16.5/17.4) (very low noise) (phono grade) (rare)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_897fe784-056b-497e-915b-8bdc1230bee7.jpg?v=1731420534){kind=link}
 (Best Overall Pair) E188CC=7308 Siemens Halske Germany NOS 1968 (16.8/18.0ma and 16.5/17.4) (very low noise) (phono grade) (rare) "Pin It")