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ID = 42755
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Solid State Rectifier   Power-supply 
Identical to ZS21 = CV4077
Similar Tubes
Normally replaceable-slightly different:

Base Wires only.
Description Rectifier Diode

Maximum - Peak Inverse Voltage: 200
Max Mean Current: 0.1A
Max Reverse Current: 0.5µA at 200V 

Dimensions (WHD)
incl. pins / tip
9 x 9 x mm / 0.35 x 0.35 x inch
Information source - - -   
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