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ID = 44792
Brand: Metrum AG; Wallisellen
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to SH21
Similar Tubes
Normally replaceable-slightly different:

Base Europe 3-Pin B3 (Eu H) Top contact screw type.
Filament Vf 10.5 Volts / If 2.8 Ampere / Direct
Dimensions (WHD)
incl. pins / tip
50 x 210 x mm / 1.97 x 8.27 x inch
Information source Schweizer Elektronenröhren 1917-2003, Willi E.   Seite 205
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