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ID = 56570
Brand: Common type Worldwide tube/semicond.
Tube type:  Radar Picture Tube   Indication 
Identical to 12SP7
First year Jul.1949 Electron Tube Registration List Ref 765

Base Duodecal (12-pin), B12A
Was used by Radar
Filament Vf 6.3 Volts / If 0.6 Ampere / Indirect / Parallel, (AC/DC)
Description 11 inch radar CRT with blue-white flash and yellow afterglow.
55 degree magnetic deflection 
Dimensions (WHD)
incl. pins / tip
318 x 318 x 475 mm / 12.52 x 12.52 x 18.70 inch
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12SP7: own collection
Patrick Marinus

12SP7: own collection
Patrick Marinus

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