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ID = 28175
Tube type:  Double Triode 
Identical to 7308S

Base Noval, 9 pin miniature (USA pico-9) B9A
Dimensions (WHD)
incl. pins / tip
20 x 55 x mm / 0.79 x 2.17 x inch
Weight 11 g / 0.39 oz
Information source -- Collector info (Sammler)   
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Just Qvigstad

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