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A441

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ID = 2455
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Space Charge Tetrode   Universal 
Identical to A441 = B11 = B1_SIF = BR
Similar Tubes
Normally replaceable-slightly different:
  B9_Kremenezky ; D410 ; DG4 ; T_Adzam ; VO
Other characteristic (electr. data):
  A441N ; DG407 ; DM300_old ; KL70410 ; RE074d ; U409D
Other base:
  A441_UX ; Bigrille-Ampli ; DG ; MX40_Fotos ; Micro-Bigril
First year Mar.1925 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
1924 : Saga of the Vacuumtube, Tyne p.421

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eu) Sidecontact
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Description Heizung 3,4 - 4V/0,06A; Sättigungsstr. 10mA; Ruhestrom 6mA; Anodenspannung 20 - 100V; Verstärkungsfaktor 6; Durchgriff 17%; Steilheit 0,45mA/V; Innerer Widerstand 13000Ω; Anwendung: A.N.L.; Preis 1927: 15ATS. Daten aus dem WEKA-Katalog 1927, Seite 163. 
Literature Radios von gestern, 2. Auflage   Seite 227
- - Manufacturers Literature   R38H 1-2-1925
  a441typicaloperatingcircuit.gif
  A441
Nicolaas van Dijk
 
a441.png
A441: R.O.
Rudolf Osterkamp

 
2_7.png
A441: Telefunken Werkstattbuch
Wolfgang Bauer

 
a441.png
A441: own collection
Peter den Boer


Usage in Models 1= 1925 ; 1= 1926 ; 2= 1927?? ; 3= 1927? ; 3= 1927 ; 2= 1928?? ; 3= 1928? ; 9= 1928 ; 3= 1929?? ; 1= 1929? ; 8= 1929 ; 1= 1930? ; 3= 1930 ; 5= 1932

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):45


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