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ID = 21489
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Ionisation or Vacuum Gauge 
Identical to IM1
Similar Tubes
Normally replaceable-slightly different:

Base SPECIAL TUBEBASE in general
Filament Vf 6 Volts / Direct
Description Vacuum-gauge tube, ionisation type. 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
31 x 123 x mm / 1.22 x 4.84 x inch
Weight 33 g / 1.16 oz
Information source - - Manufacturers Literature   Telefunken Spezialröhren, 1968

im_1_sockel.png IM1: Telefunken Spezial-Röhren 1966
Heinz Höger

IM1: Telefunken Handb. d. Rundfunkröhren
Peter Hoddow

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