Attention! Last image was taken from google photo stock to explain how tube is glowing! All other photos are real! You will get what on it.

The OG-8 is a very unusual high speed counting tube. The tube is a single guide, unidirectional design with a carbolite octal base. Argon filled. The tube has 20 bent cathodes under a heavy shade ring, five of which are brought out to individual pins on the base. The tube's rated counting speed is 100Khz and the fill gas in unknown, though it appears to contain a mix of hydrogen and other gases. The OG-8's anode voltage is much higher than other dekatrons: the tube must be driven at nearly 600 volts to achieve ionization. Normal dekatron driver circuits have trouble spinning the OG-8, and the home experimenter should not expect a stock spinner design to work reliably with this tube.


OG-8
Decatrons-pulse counting with the direction of the cathode for use in counting and computing
devices for frequency division. It is used in computer engineering, instrumentation and various
counting device electronic equipment.
Light color - blue. Members cold cathodes. Work in any position.
Indication is made through the dome of the container. Registration - glass, with cap (RSH5-1).

Basic data
The conversion factor of 10
Power supply voltage> 400 W
Firing voltage <480
Discharge sustaining voltage 255-295 In
The bias voltage to 36-44 in subcathodes
The amplitude of the voltage pulse discharge in 75-125
Ignition delay time <5
Operating current of 1.1-1.3 mA
These control pulses:
counting speed 000 Hz * 0.01-100
The amplitude of the pulse 80-110
pulse duration> 3 ms
front duration 0.3-1 ms
Reset pulse duration> 10 ms
Working hours> 500 hours
Guaranteed shelf life of 8 years
The maximum allowable parameters
The output voltage on the cathodes 7
Cathode load resistance <7.5 ohms
Operating temperature range -60 ... +70 ° C
* At 1 Hz decatrons not allowed to work more than 2 hours, provided the subsequent operation at frequencies of 50 Hz and above for an hour, the total standing time of discharge does not exceed 50 hours.