A4

4 Tube TRF radio.

English translation from advertisement found with this radio.

A.-B. ALLSVENSK RADIO • STOCKHOLM Beridarebansgatan 17 • Telegram address Allsvenskradio • Phone Norr 9925

They claimed: The Swedish Radio Success
Joel Östlinds A 4 4-tube receiver with a wavelength range of 250-550 to 600 meters. One stage high frequency gain, detector and 2 stage low frequency gain. The first commercial radio receiver with low loss coils. The unprecedented long distance receiver for speakers. superior efficiency. Easy care. Insensitive to hand capacity. Reliable. Solid material. Tasteful exterior. Price kr. SEK 310, including a telephone terminal for 4 telephones and battery cables with a non-removable plug. With battery box of boned mahogany SEK. 34o: - Made with one-stage high-frequency gain, detector and two-stage low-frequency gain. The device has extremely high tuning sharpness and is provided with two different antenna and ground connections, one leading to an unbalanced primary circuit, the other to direct connection. A 4 stands at the height of what radio technology has been able to produce and will probably remain unmatched for a long time to come in its class. See also special prospectus on A 4, which was sent on request. The box is of mahogany. The price does not include tubes, batteries and telephone. Accessories for A 4 - see p. 14th

A 4 also comes with device for extended wavelength range 250-2000 meters

Price for the device SEK. 35: -, for kit honeycomb coils SEK. 27: 5o. Holders of A 4, designed for the wavelength range 250-55o at 600 meters, can have the device extended to include up to 2000 meters wavelength at a cost of SEK. 35: - excluding coils. The device must be sent to us for change.

Vous pourrez trouver sous ce lien 2 modèles d'appareils, 2 avec des images et 0 avec des schémas.
Tous les appareils de Östlind, Joel, & Co.; Stockholm