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Dynamic Noise Filter DNF1201

Dynamic Noise Filter DNF1201; Burwen Laboratories (ID = 227280) Misc
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Dynamic Noise Filter DNF1201; Burwen Laboratories (ID = 227280) Misc
Burwen Laboratories: Dynamic Noise Filter DNF1201 [Misc] ID = 227280 933x368
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For model Dynamic Noise Filter DNF1201, Burwen Laboratories Inc.; Lexington (MA)
Country:  United States of America (USA)
Manufacturer / Brand:  Burwen Laboratories Inc.; Lexington (MA)
Year: 1972 Category: Miscellaneous (Other, Various) - see notes
Semiconductors (the count is only for transistors) 4:
Main principle something special ? Please give information (notes)
Wave bands - without
Power type and voltage Alternating Current supply (AC) / (110) 220 Volt
Loudspeaker - For headphones or amp.
Power out
from Model: Dynamic Noise Filter DNF1201 - Burwen Laboratories Inc.;
Material Various materials
Shape Book-shelf unit.
Dimensions (WHD) 290 x 95 x 220 mm / 11.4 x 3.7 x 8.7 inch
Notes 2-channel dynamic noise filter for audio signals. Two setups including one for records with 78 RPM. Bandwidth controller with sliding low-pass cut-off frequency from 27kHz down to 600Hz, depending of signal-amplitude and -frequency. Circuit uses 16 op-amp stages plus the transistors. Originally developed to compete the Dolby NR system. The successor of this model (but without the setup for '78') is the DNF1201A by KLH.
Net weight (2.2 lb = 1 kg) 3.4 kg / 7 lb 7.8 oz (7.489 lb)
Source of data - - Data from my own collection
Mentioned in - - Data from my own collection

Model page created by Georg Richter. See "Data change" for further contributors.

All listed radios etc. from Burwen Laboratories Inc.; Lexington (MA)
Here you find 2 models, 1 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.