![](https://coimages.sciencemuseumgroup.org.uk/49/824/medium_thumbnail_2009_5049.jpg)
BBC Portable Tone Source
- Made:
- circa 1930
![Portable tone source](https://coimages.sciencemuseumgroup.org.uk/514/431/medium_smg00216365.jpg)
Continuously variable 40Hz to 10 KHz in three ranges. R/C oscillator, battery or mains. 4 Valves. Missing main air-spaced variable capacitor and control knob.
Details
- Category:
- Television
- Collection:
- BBC Heritage Collection
- Object Number:
- 2012-5118/103
- Materials:
- wood (unidentified), plastic (unidentified), metal (unknown) and electronic components
- Measurements:
-
overall: 280 mm x 500 mm x 195 mm, 9.5 kg
- type:
- audio equipment