- Country
- Great Britain (UK)
- Manufacturer / Brand
- Columbia Graphophone Co.; London
- Year
- 1930
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 230504
- 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
- - This model requires external speaker(s).
- Material
- Wooden case
- from Radiomuseum.org
- Model: 307 - Columbia Graphophone Co.;
- Shape
- Tablemodel, Box - most often with Lid (NOT slant panel).
- Dimensions (WHD)
- 360 x 320 x 240 mm / 14.2 x 12.6 x 9.4 inch
- Notes
-
With screen-grid 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.
- 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