The 6C21D is a translation from the Cyrillic letters on the case. It is a UHF pencil triode with the outer case containing resonant cavities. This forms a self contained UHF oscillator with an output in the region of 0.25 Watt.![](../pics/aaa1864a.jpg)
The two wires are probably the heater or filament. The tab connects to the cathode.![](../pics/aaa1864b.jpg)
The opposite end has a coaxial output probe and the tab connection is to the anode..![](../pics/aaa1864c.jpg)
The adjustment screw on the case has a wire under the locking washer. The overall length from tap to tap is 70 mm.See 5794 for details of a similar device.The thin metal tube envelope is 22 mm in diameter and, excluding the base pins, is 43 mm tall.References: Internet. |
Updated March 12, 2021.
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