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ID = 19999
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes 
Identical to 6К17Б = 6К3 = 6SK7


No tubes were ever produced under this designation. This type designation was planned in the Soviet Union in 1948, but later replaced by type 6k3.

See more under: The tube lineup of the receiver Baltika RZ-1

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You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]