(!!!) (Single) EC92=6AB4 Siemens Halske Germany branded Mullard 1964 (8.4ma) (mic)

EC92=6AB4 Siemens Halske Germany branded Mullard 1964

8.4ma

Gm=4800

Tested on Amplitrex:

Vplate=250V

Vgrid=-2V

Good Ma range 7.5-10ma

Good Gm 4500-6000

(low noise, balanced, nice detail and extension)