Amplifier and Null Detector 1231-B
General Radio Company; Cambridge (MA)
- Country
- United States of America (USA)
- Manufacturer / Brand
- General Radio Company; Cambridge (MA)
- Year
- 1948–1959
- Category
- Service- or Lab Equipment
- Radiomuseum.org ID
- 204824
-
- alternative name: GenRad
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 4
- Main principle
- Audio-Amplification
- Wave bands
- - without
- Power type and voltage
- Dry Batteries
- Loudspeaker
- - For headphones or amp.
- Material
- Metal case
- from Radiomuseum.org
- Model: Amplifier and Null Detector 1231-B - General Radio Company;
- Shape
- Tablemodel, low profile (big size).
- Dimensions (WHD)
- 8 x 12.25 x 10.75 inch / 203 x 311 x 273 mm
- Notes
- Sensitive visual null indicator for audio-frequency bridges. Headphone monitoring also possible. Can also be used as a high-gain (>80 dB) audio amplifier. Frequency response is essentially flat from 50 Hz to 5 kHz and usable for null indications at reduced sensitivity from 10 Hz to 100 kHz.
- Net weight (2.2 lb = 1 kg)
- 23 lb 12 oz (23.75 lb) / 10.783 kg
- Price in first year of sale
- 290.00 $
- Source of data
- - - Manufacturers Literature
- Author
- Model page created by Paul Reid. See "Data change" for further contributors.
- Other Models
-
Here you find 238 models, 212 with images and 128 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from General Radio Company; Cambridge (MA)
Collections
The model Amplifier and Null Detector is part of the collections of the following members.