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ID = 28500
Tube type:  LOCKED OFF TUBE (CODE 9) - see in Notes 
Identical to DES625 = S625
First year 1927 Saga of the Vacuumtube, Tyne Seite 383

Filament Vf 6 Volts / If 0.25 Ampere
Description Same as S625, see there. 

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