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UM4

Country:  Europe      Brand:  Common type Europe tube 
  Developer:  Philips; Eindhoven (tubes international!); Netherlands 
  Tube type:  Mag. Eye, 2 ranges, 2 shadow angles   Indication 
Tube ID = 675
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Identical to UM4 = 10M2 = MUM4 = 13M4U
Similar Tubes Normally replaceable-slightly different:
 UM35
Different connections:
 UM34
Multiple differences or of other kind:
 OM5_MagicEye; PM5_MagicEye
First year   1940 Tube leaflet collection E.Erb Analysis by original leaflets (P41-1)
First Source (s) Jan.1940 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Predecessor Tubes C/EM2  
Successor Tubes 1954 UM34   UM80   UM85  
Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=V)
Was used by Radio/TV-reception etc.
Filament Vf 12.6 Volts / If: 0.1 Ampere / -: Indirect / -: Parallel / series AC/DC /
Tube prices 5 Tube prices (visible for members only)
Literature Taschenbuch zum Röhren-Codex 1948/49   

  um4.gif
  UM4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
um4mullardillumineep2s.jpg
UM4
Patrice Zeissloff
 
oc27_g_2.gif
UM4: RTT Schwandt
Günther Stabe
 
um4_spec.png
UM4: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector
Usage in Models   5= 1940?? ; 9= 1940 ; 13= 1941 ; 1= 1942?? ; 1= 1942? ; 22= 1942 ; 1= 1943? ; 6= 1943 ; 1= 1944? ; 4= 1944 ; 4= 1945? ; 1= 1945 ; 3= 1946?? ; 1= 1946? ; 5= 1946 ; 2= 1947?? ; 2= 1947? ; 6= 1947 ; 3= 1948?? ; 4= 1948? ; 54= 1948 ; 2= 1949?? ; 11= 1949? ; 83= 1949 ; 4= 1950?? ; 10= 1950? ; 80= 1950 ; 1= 1951?? ; 8= 1951? ; 80= 1951 ; 3= 1952?? ; 4= 1952? ; 50= 1952 ; 2= 1953?? ; 6= 1953? ; 21= 1953 ; 3= 1954? ; 22= 1954 ; 3= 1955?? ; 2= 1955? ; 4= 1955 ; 2= 1956?? ; 1= 1956? ; 2= 1957? ; 2= 1957 ; 2= 1958?? ; 2= 1958? ; 1= 1958 ; 1= 1959?? ; 1= 1959 ; 3= 1960?? ; 1= 9999??
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):   565
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