(!!!) (Best Single) EC92=6AB4 Siemens Halske Germany branded Mullard NOS 1964 (10ma)

EC92=6AB4 Siemens Halske Germany branded Mullard NOS 1964

10ma

Gm=5700

Tested on Amplitrex:

Vplate=250V

Vgrid=-2V

Good Ma range 7.5-10ma

Good Gm 5000-6000

(low noise, balanced, nice detail and extension)