High Fidelity TRF Unit
National Company; Cambridge & Malden (MA)
- Country
- United States of America (USA)
- Manufacturer / Brand
- National Company; Cambridge & Malden (MA)
- Year
- 1937–1939 ?
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 286219
-
- alternative name: National Toy Co.
- Brand: Thrillbox
National Catalog No. 280 - 1938
National Catalog No. 280 - 1938
- Main principle
- TRF without regeneration
- Wave bands
- Broadcast only (MW).
- Power type and voltage
- Powered by external power supply or a main unit.
- Loudspeaker
- - For headphones or amp.
- Material
- Metal case
- from Radiomuseum.org
- Model: High Fidelity TRF Unit - National Company; Cambridge &
- Shape
- Rack
- Dimensions (WHD)
- 0 x 3.5 x 0 inch / 0 x 89 x 0 mm
- Notes
-
The National High Fidelity TRF Unit is a single signal receiver. It was available as a kit. There are three models, covering the ranges of 540-875 KHz, 740-1230 KHz, and 1100-1700 KHz. Customers could choose the one frequency in the range that they desired. National recommended using four, or more, of these receivers, set to different frequencies, and using a push switch or relay system to select between the stations.
The following components make up the unit: DLC (drilled only) or DLCA (drilled with sockets and terminals) chassis, DLPS (1/8-inch steel) or DLPA (3/16-inch aluminum) panel, and DLT transformers (four required per unit).
- Mentioned in
- National Catalog No. 280 - 1938
- Author
- Model page created by Wayne Childress. See "Data change" for further contributors.
- Other Models
-
Here you find 446 models, 285 with images and 189 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from National Company; Cambridge & Malden (MA)