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ID = 6433
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Mag. Eye, 2 shadow angles   Indication 
Identical to DM21 = MDM21
Similar Tubes
Other base:
First year Apr.1940 Tube leaflet collection E.Erb Philips-Archive, Book 3 = April
First Source (s)
Apr.1940 : Daten und Schaltungen moderner ... Röhren; Philips # 3
Mar.1940 : Philips Bulletin # D78

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vo)
Filament Vf 1.4 Volts / If 0.025 Ampere / Direct / Battery =
Information source Taschenbuch zum Röhren-Codex 1948/49   
  DM21: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
DM21: My own collection
Hannu Alho

More ...
DM21: Telefunken Werkstattbuch
Wolfgang Bauer

DM21: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

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from Just Qvigstad

Usage in Models 1= 1940 ; 1= 1949

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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