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ID = 27862
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Vacuum Pentode   clamp grid   Universal 
Identical to CV3998 = E180F = 5A/170K

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AC/DC
Description Special Quality Valve. RF Pentode with gm of 16.5. Triode connected, it achieves gm of 21mA/V.
Specied by UK's General Post Office. 
Information source -- Original-techn. papers.   
CV3998: Private collection
Emilio Ciardiello

CV3998: rtt
Michael Schlör


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