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ID = 31139
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Vacuum Pentode   Universal 
Identical to CV4085 = M8195
Similar Tubes
Other class quality (otherwise equal):
  CV2901 ; EF86
Other base and data slightly different:

Base Noval, B9A
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC
Description Special quality version of the CV2901 (EF86).
Mullard and MOV are known manufacturers. 
Dimensions (WHD)
incl. pins / tip
22 x 61 x mm / 0.87 x 2.40 x inch
Information source - - Manufacturers Literature   
CV4085: aus ebay, Verkäufer wonderco_buy
Gottfried Silberhorn

CV4085: RTT
Michael Schlör

CV4085: DataSheet
Franz Scharner

from Just Qvigstad

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