30mm symbol tube manufactured by Tesla

The ZM1049 is a special character indicator tube with clear glass manufactured by Tesla. The tube can display alphabetic letters. The tube is very rare and there is also a red-coated version, the ZM1047. There are similar character tubes like the ZM1043S and the ZM1041S
Brand / Manfacturer Tesla
Same Types
Likely Tyes
Symbol height in mm 30
Characters / Symbols F,G,H,M,NS,T,X,Y,Z
Decimal point none
Base / Socket B13B
Starting Voltage (typ) 170 V
Maintaining Voltage (typ) 140 V
Current per Segment 4.5mA
Reccomend Resistor 6.8kOhm = 4.5mA