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Information - Help 
ID = 30687
Brand: Common type Europe tube/semicond.
Tube type:  Double Triode   Universal 
Identical to CV491 = B329
Similar Tubes
Normally replaceable-slightly different:
Other class quality (otherwise equal):
  12AU7 ; CV4003 ; ECC82 ; M8136
Heater different:

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 12.6 Volts / If 0.15 Ampere / Indirect / Specified voltage AND current AC/DC
Description This spec refers to the 12AU7. Tubes are 100% tested for Gm, emission and other parameters.
Tapped heater also permits operation at 6.3V 0.3A. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
22 x 57 x mm / 0.87 x 2.24 x inch
Weight 14 g / 0.49 oz
Information source - - Manufacturers Literature   

cv491_so.png CV491: ARRL Handbook 1972
Anonymous 10 Collector

Just Qvigstad
CV491: Manufacturer's Literature
Emilio Ciardiello

More ...
Usage in Models 1= 1950??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of



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