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Amplifier and Null Detector 1231-B

Amplifier and Null Detector 1231-B; General Radio (ID = 1079076) Equipment
Amplifier and Null Detector 1231-B; General Radio (ID = 1074481) Equipment
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Amplifier and Null Detector 1231-B; General Radio (ID = 1074481) Equipment
General Radio: Amplifier and Null Detector 1231-B [Equipment] ID = 1074481 571x412
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For model Amplifier and Null Detector 1231-B, General Radio Company; Cambridge (MA)
 
Country:  United States of America (USA)
Manufacturer / Brand:  General Radio Company; Cambridge (MA)
alternative name
 
GenRad
Year: 1948–1959 Category: Service- or Lab Equipment
Valves / Tubes 4: 1U4 1U4 1U4 1U4
Main principle Audio-Amplification
Wave bands - without
Details
Power type and voltage Dry Batteries
Loudspeaker - For headphones or amp.
Power out
from Radiomuseum.org Model: Amplifier and Null Detector 1231-B - General Radio Company;
Material Metal case
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

Model page created by Paul Reid. See "Data change" for further contributors.



All listed radios etc. from General Radio Company; Cambridge (MA)
Here you find 216 models, 197 with images and 84 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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