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PM2

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ID = 3794
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Power/Output 
Identical to PM2
Similar Tubes
Normally replaceable-slightly different:
  CV1019 ; CV1020 ; NR28 ; P220_Lissen ; TB052 ; ZD2
Other base:
  PM2_UX
First year 1926 Saga of the Vacuum Tube, Tyne
First Source (s)
1926 : Saga of the Vacuum Tube, Tyne p.379
1926 : History of the British Radio Valve to 1940 p. 160
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =
Description

Gm=1.7mA/V at Va=100 Vg=0 Z=4.4k ohm.

Advertisement of August 1926 in wireless world claims filament current of 0.15A, which is shown on some tube labels. This claim and subsequent update to 0.2A is the same as for the Cossor "Stentor two".

 
Text in other languages (may differ)
Information source - - Manufacturers Literature   
History of the British Radio Valve to 1940   p. 150 & 160
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
1_104.png PM2: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
Usage in Models 2= 1926?? ; 6= 1926 ; 1= 1927? ; 2= 1927 ; 5= 1928?? ; 1= 1928? ; 3= 1928 ; 6= 1929?? ; 4= 1929? ; 7= 1929 ; 1= 1930? ; 2= 1930 ; 3= 1931? ; 4= 1931 ; 1= 1932?? ; 2= 1932? ; 6= 1932 ; 1= 1933?? ; 2= 1933? ; 3= 1934?
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):62

Collection of

Adalbert Gebhart (CH)
John Koster (NL)
Roy Johnson (GB)
Gwyn Griffiths (GB)
Antonio Varrica (I)
Rudolf Osterkamp (D)
Peter Pfeiffer (D)
 
pm2_bild1.png

PM2
 
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