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M300

Information - Help 
ID = 2539
       
Country:
Netherlands
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Radio-Record - Röhrenmarke; Holland 
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to M300
Similar Tubes
Normally replaceable-slightly different:
  A409 ; G407 ; L308_Marathon
First year 1927 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
16.Oct.1925 : Radio-Expres, Netherlands

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 4 Volts / If 0.06 Ampere / Direct / Battery =
Description HF, LF, Det. 
Dimensions (WHD)
incl. pins / tip
40 x 87 x 31 mm / 1.57 x 3.43 x 1.22 inch
Weight 35 g / 1.23 oz
Literature - - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49   
 
m300.jpg
M300: R.Latzel
Anonymous 902 Collector

 
m300_sock.png
M300: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

 
m15m300_1.png
M300: own collection
Peter den Boer


Usage in Models 1= 1927

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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