??mm symbol tube manufactured by National Electronics
The NL-864 is a clear glass symbol tube made by National Electronics. There is one symbol row with "Hz, S," and on top a second row with "K,µ,n,M", making it possible to display "kHz". I guess this tube was used in a frequency counter or similar device. Currently i have no more info about this tube or any data. It seems to be a rather rare tube.
|Symbol height (mm)||??|
|Starting Voltage (typ)||0 V|
|Maintaining Voltage (typ)||0 V|
|Current per Segment||0mA|