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ID = 27521
Brand: Common type Japan tube/semicond.
Tube type:  Diode-Pentode   RF/IF-Stage 
Identical to 1B2_1S5 = DAF91 = 1S5 = ZD17

Base Miniatur-7-Pin-Base B7G, USA 1940
Description 1B2 is the name for an "Urdox-FeH-Resitor from the USA. Therefore we distinguish this 1B2 Diode Pentode with a special suffix. Sometimes the 1B2 is also written as 1B-2 or 1 B 2. 
Dimensions (WHD)
incl. pins / tip
19 x 55 x 19 mm / 0.75 x 2.17 x 0.75 inch

1B2_1S5: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †

530_1~~1.png 1B2_1S5: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad

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