-mm special tube manufactured by Htiachi
The H1501 is a special character nixie tube. I found out that this logo on the tube is an old hitachi logo, so this tube was manufactured by Hitachi. It can display roman numbers one and two, a minus sign and a special symbol. If you power the minus sing and the special symbol at the same time the letter E is displayed. There is a smiliar tube, the H1544, which also has a roman three symbol.
|Symbol height (mm)||-|
|Starting Voltage (typ)||150 V|
|Maintaining Voltage (typ)||0 V|
|Current per Segment||0mA|
|Reccomend Resistor||Tested with 150V and 18kOhm|