- Country
- Great Britain (UK)
- Manufacturer / Brand
- Columbia Graphophone Co.; London
- Year
- 1930
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 231070
Advertisement in Wireless World, 1930.
- Number of Tubes
- 4
- Main principle
- TRF with regeneration
- Tuned circuits
- 2 AM circuit(s)
- Wave bands
- Broadcast (MW) and Long Wave.
- Power type and voltage
- Alternating Current supply (AC) / 200-250 Volt
- Loudspeaker
- -Loudspeaker incorporated, but system not known.
- Material
- Wooden case
- from Radiomuseum.org
- Model: 331 - Columbia Graphophone Co.;
- Shape
- Console, Lowboy (legs < 50 %).
- Notes
-
A three valve (+ rectifier) pedestal model in mahogany or walnut cabinet with silver oxidised metal escutcheon and pilot lamp.
For medium and long wave reception.
Thumbwheel tuning, volume control (Intensifier) and reaction. With screen-grid valve, detector and pentode output valve. The HF is tuned anode and the detector is resistance/capacity coupled to the intervalve transformer. A hum bucking circuit is used for smoothing, and a hum adjusting device, consisting of grid-leak to detector brought to potentiometer across heater winding. The set uses a 6 volt 624BU rectifier. Walnut version 31 Gns. Same chassis as Columbia 307.
- Price in first year of sale
- 31.50 GBP
- Source of data
- Wireless World (The), London (WW, 79)
- Author
- Model page created by John Koster. See "Data change" for further contributors.
- Other Models
-
Here you find 52 models, 30 with images and 23 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Columbia Graphophone Co.; London