1 low noise tube) E188CC=7308 Telefunken West Germany <> bottom gold pins 1960's - faded printing 

1 section) 12.6ma Gm=11,600

1 section) 19.0ma Gm=12,900

7308=Premium low noise 6922

I use 1 pair in a Modwright ph 9.0x phono preamp

Tested on Amplitrex

Vplate=90V

Vgrid=-1.2V

Good Ma range 12-15ma

Good Gm range 11,000 - 13,000

Recommended for

- Cary Audio HH-1 hybrid headamp
- Conrad Johnson ET5
- Cavalli Liquid Glass
- Audion Black Shadows 2011
- Rode NTK1 mic
- RODE K2 mic
- EAR
- LAMM LL2
- LAMM M1.2 mono amps
- Manley Steelhead
- Audio Note
- Audible Illusions L1
- Audio Research