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U70A; Centrum-Radio, (ID = 900088) Radio
Centrum-Radio,: U70A [Radio] ID = 900088 933x616
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For model U70A, Centrum-Radio, Gylling & Co.; Stockholm
Country:  Sweden
Manufacturer / Brand:  Centrum-Radio, Gylling & Co.; Stockholm
Year: 1941 ? 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 Broadcast and LongWave in ONE range.
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, Gylling & Co.;
Material Wooden case
Shape Tablemodel without bush buttons, Mantel/Midget/Compact up to 14
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, Gylling & Co.; Stockholm
Here you find 180 models, 132 with images and 61 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.