Crystal-sets

 





Baltic MK1 (1924)


 



Telefunkon "A"  ( 1923 - 25 )



ELKA (Radio-Amato) 1925
Berlin

 

ASAS 
(with headphone)

A/S Elektrisk Bureau Oslo
 

Roland
Denmark

Baduf 1001
  Furtwangen, Baden, Germany
Badische Uhrenfabrik.(1924)

Hjerter-es
Sweden

 

EKA
 

Minim

 

Megro 
Czechoslovakia 

Homebrewed

Sachenwerk: SW
Germany

Brownie: BBC
UK

Unknown  Crystal: Friho
Germany
 


Homebrewed ?