2x tubes az12 Philips
same code HB1 G1E
big & large smooth plate
grey plate
hanging filament
O getter slanted bottom
black base
fully tested & balanced emission
tube 1 = 160mA/160mA (reference good at 60mA/60mA)
tube 2 = 150mA/150mA (reference good at 60mA/60mA)
AZ12 = VG3716 = 241NG
Socket German Steel Y8A
Filament Heater Vf 4 Volt / If 2.3 Ampere / Direct
box 149