KOOMANS 4 TUBE RADIO from 1924
This radio was built by enthusiasts themselves at the time, stimulated by the Association of Workers Radio Amateurs.
The parts at the time already cost around 300 guilders.
No small thing for that time and certainly for a worker who earned about 7 guilders per week.
There was a three tube version first.
The long and medium waveband can be received.
About the designer ir. Koomans:
"Nicolaas Koomans (18 December 1879 – 4 October 1945) was chief engineer of Telegraphy and Telephony and chief of the RadioLaboratorium der Rijkelegraaf. He also designed an “easy” circuit diagram of a three-tube radio receiver that can be built by amateurs that became known as the “Koomans circuit diagram”. A large part of the early Dutch amateur receivers is based on this design, which was later expanded to a four-tube circuit diagram. An article from 1926 describes the device as follows: "In this diagram, both the grid circuit and the plate circuit of the H.F. tube are tuned using tuning capacitors, increasing the tendency for spontaneous generation.
The device is complete with diagram.
- 4 Lamps
- Tipo de equipamento
- N.º de itens
- Cabo de ligação
- 10 kg
- Testado e a funcionar.
- Tested and working/playable