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ID = 28248
Tube type:  Signal Diode - one single system 
Identical to CV258
Similar Tubes
Normally replaceable-slightly different:
  CV58 ; REL47

Filament Vf 6.3 Volts / If 0.36 Ampere / Half indirect
Description Vacuum diode developed by GEC, as selected CV58. Tested for pulse peak emission greater than 60mA at 200V anode supply. 
Information source -- Original-techn. papers.   
CV258: Private collection
Emilio Ciardiello

CV258: Manufacturer's Literature
Emilio Ciardiello

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