radiomuseum.org

 
Please click your language flag. Bitte Sprachflagge klicken.

DER

Information - Help 
ID = 2479
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Triode, vacuum   Audio Frequency 
Identical to DER = CV1642 = VT33_GPO
Similar Tubes
Other shape (e.g. bulb type):
  LT1
First Source (s)
1922 : British Radio Valves - The Vintage Years, Thrower p.51,52
1925 : Saga of the Vacuumtube, Tyne p.382
Predecessor Tubes LT1  

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 1.8 Volts / If 0.35 Ampere / Direct / Battery = /
Description Codex erroneously notes for the filament 2V, 0.1A; but the predecessor LT1 has the same filament data 1.8V, 0.35A.
Production of these tubes was maintained well into the 1930s with a modern shape glass and base but maintaining the horizontal cylindrical form. This was one of the last types with this early structure. 
Literature - - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49   

 
der.jpg
DER: own collection
John Koster

 
der_spec.png
DER: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector


Usage in Models 1= 1922 ; 4= 1923? ; 2= 1923 ; 8= 1924 ; 5= 1925

Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):20


You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
rmXorg