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ID = 22115
Tube type:  Voltage Regulator, single 
Identical to GR27-56
Similar Tubes
Other base:

Base Miniatur-7-Pin-Base B7G, USA 1940
Description 1 Glimmstrecke, max. Zündspannung 140 V, Brennspannung 70...90 V, I ca. 0.3 ... 6 mA, Ri ca. 2000 Ohm. 
Information source Röhren-Taschen-Tabelle, (Franzis RTT)   
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mi59_g_4.gif GR27-56: RTT Schwandt
Günther Stabe † 19.8.20

Just Qvigstad

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