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ID = 30997
Tube type:  Double Triode   Frequency converter 
Identical to CV3986 = 6021 = ECC70
Similar Tubes
Normally replaceable-slightly different:

Base Subminiatur-8, with space 1/8, B8D Wires only.
Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Parallel / series AC/DC
Description Pa <700mW; Ia <22mA pk. 
Information source -- Original-techn. papers.   
CV3986: Private collection
Emilio Ciardiello

CV3986: rtt
Michael Schlör


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