IN-1 (No Base)
18mm numeric tube manufactured by Reflector/Sovtek
This tube looks like a IN-1 without the big brown base. This tube was either made for soldering into a board, but its more likely that this is a part of an IN-1. Maybe this part of the tube was manufactured and then assembled into a IN-1 by adding the base. It has no markings or anything else on the glass, but because of its shape it clearly can be identified as "IN-1". There is also a version with a fine grid.
|Symbol height (mm)||18|
|Starting Voltage (typ)||170 V|
|Maintaining Voltage (typ)||135 V|
|Current per Segment||3mA|
|Reccomend Resistor||12.6kOhm = 2.8mA|