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The RYG-10 is a beam switching counter indicator tube of the Trochotron type. An external cylindrical magnet is required for operation unlike the VS10G.
The RYG-10 is special in being able to display its own count position with a circular fluorescent display. Unlike the cold cathode Dekatron types that indicate position by virtue of ionisation around an active electrode the RYG-10 is a thermionic device that uses activated phosphor to indicate position. In this respect the RYG-10 is like a magic eye tuning indicator in the colour of the display. The E1T is also a thermionic decade counter that has a direct horizontal readout.
Each of the targets in the valve are energised as the beam switches in rotation. The maximum counting speed is 1 MHz. It is believed that the heater is 6.3 Volts but this need to be confirmed.
Side view showing the target flutes that hold the phosphor.
Top view.
A still from a youtube video. This shows one illuminated segment. The tube is surrounded by an electromagnet.
The thin glass tube envelope is 25 mm in diameter, and excluding the base pins is 47 mm tall.
References: Patent application & internet.


Absolute Maximum Operating Conditions
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 26, 2016.
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