The Soviet-made A108 dekatron is a strange tube; it is one of the smallest counting tubes ever made, and it has an unusual internal construction with only 10 cathodes instead of the 30 cathodes typical for a dekatron counting tube. The cathodes are bent at an angle and designed to be driven with a flip flop, but the tube will work just fine with most dekatron circuits, including the common line voltage 'spinner' circuits available on the Web.
Soviet A108 dekatron tube.
The A108 has bent cathodes and can only count in one direction.
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