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U70A; Centrum-Radio AB (ID = 900088) Radio U70A; Centrum-Radio AB (ID = 900090) Radio
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U70A; Centrum-Radio AB (ID = 900088) Radio
Centrum-Radio AB: U70A [Radio] ID = 900088 933x616
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For model U70A, Centrum-Radio AB Gylling & Co.; Stockholm
Country:  Sweden
Manufacturer / Brand:  Centrum-Radio AB Gylling & Co.; Stockholm
Year: 1939 ? Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 4: 14J7 12K7GT 35L6EG 35Z5GT
Main principle Superheterodyne (common); something special ? Please give information (notes)
Tuned circuits 3 AM circuit(s)
Wave bands Wave Bands given in the notes.
Power type and voltage AC/DC-set / 115; 130; 150; 220 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out
from Model: U70A - Centrum-Radio AB Gylling & Co.
Material Wooden case
Shape Tablemodel, Mantel/Midget/Compact up to 14" width, but not a Portable (See power data. Sometimes with handle but for mains only).
Dimensions (WHD) 230 x 210 x 180 mm / 9.1 x 8.3 x 7.1 inch
Notes This is a compact, wooden radio that has no visible tuning knob or dial glass. With only a volume knob at the front it looks more like a small speaker.

A variable inductance tuning coil can be accessed from the back, stating a continuous tuning range from 200 to 2000m.
The same "tuning knob" can be pushed / pulled for audio tone control.
The continuous tuning range from 200 to 2000m seems ambitious. Perhaps a combination of manual RF and internal IF tuning could achieve this large span.

Lacking any service docs, I'm not sure about the exact operating principle. The chassis coils and tube lineup suggests this is not a 'standard' superhet with 2 IF stages. A 'typical' triode-diode valve like the 12Q7GT used in the Centrum U68 is not used here.

As other Swedish Centrum radio's at the time, many components were sourced from the USA. See the pictures for more details.

Model page created by Robert Kooijman. See "Data change" for further contributors.

All listed radios etc. from Centrum-Radio AB Gylling & Co.; Stockholm
Here you find 124 models, 85 with images and 51 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.