Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 31581
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Tube type:  Pentagrid-Converter (Heptode)   Frequency converter 
Identical to 1C1 = DK91 = X17

Base Miniatur-7-Pin-Base B7G, USA 1940
Was used by Radio/TV-reception etc.
Filament Vf 1.4 Volts / If 0.05 Ampere / Direct / Battery =
Description Ediswan or Mazda branded. Sometimes also marked DK91 also. 
Dimensions (WHD)
incl. pins / tip
19 x 54 x mm / 0.75 x 2.13 x inch
Weight 10 g / 0.35 oz
Information source - - Manufacturers Literature   
Egon Strampe
Anonymous 413 Collector

More ...
1C1: rtt
Michael Schlör

More ...
1C1: Original data sheet
Michael Schlör

More ...

from Just Qvigstad

Usage in Models 1= 1947 ; 2= 1949 ; 4= 1950 ; 2= 1951 ; 1= 1952 ; 1= 1954??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):11

Collection of a member from FIN

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]