MTX-90 

Thyratron`s Glow: You can use it also like a nixie light bulb.
Intended for working with low signals and like a ionic relay. 
Filing - neon. 
Envelope - glass, miniature. 
Mass - 4g. 
Leds: 1 - Cathode, 2 - Anode, 3 - Grid.

General parameters:

Brightness: at least 80 Cd/m2 
Viewing angle: at least 60 degree 
Anode voltage: 
free grid: <200V 
Grid to Cathode connection: <140V 
if grid current=1mkA: 85-150V 
Discharge inception voltage: 
Anode-Cathode: <150V 
Grid-Cathode: 65-90V 
Discharge maintaining voltage: 
Anode-Cathode: <65V 
Grid-Cathode: 85V 
Discharge inception Grid current: 
at Ua=150V: >2mkA 
at Ua=120V: 8-40mkA 
at Ua=85V: <100mkA 
Anode curent: 
in on-off operation: <35mA (amplitude) 
in on-off operation: <7mA (average) 
in trigger operation: <4mA (amplitude) 
in trigger operation: <2mA (average) 
Input signal amplitude: 1.5-15 V 
Restoration time: >800mks 
Working period: 
in on-off operation: >4000 times 
in trigger operation: >5000 hours