| Dick's Tidbits Ideas, thoughts, and comments on audio etc., updated occasionally |
Unpublished Article On Upgrading My Computer in 1997 - Tragically hilarious.
Dick Burwen's Famous Strawberry Lemonade Recipe - Served during Hi-Fi nights.
A product of 10 years of research.
Dick Burwen's new Quick Strawberry Lemonade Recipe, 2010
Save a half hour of lemon juicing. Tastes about as good.
Objectives in High Fidelity Amplifier Design 1945
Written when Dick Burwen was a freshman at Harvard, this article showed the need for equalization to compensate poor frequency response in speakers
and program sources. The article was sold to a now extinct magazine, but never published.
Krohn-Hite Ultra-Low Distortion Power Amplifier, Instructions for Model UF-101, 1954
Krohn-Hite UF-101.pdf.
50 watts at 0.005% distortion from 4 - 6550 tubes, produced for 20 years as a laboratory instrument, designed by Dick
Burwen Laboratories Model 1000 Dynamic Noise Filter - 1970s
A one-way noise reduction system for tape hiss and record rumble used by recording studios and radio stations.
Product literature - Dynamic Noise Filter Model 1000 - March 1974.pdf
How it works - A Dynamic noise Filter for Mastering - Audio June 1972.pdf
How to operate and fix it - Dynamic Noise Filter 1000 Manual.pdf
Burwen Laboratories Noise Eliminator Model 2000 - 1970s
This was Dick's toughest engineering challenge - a 3:1 companding noise reduction system that added 50 dB dynamic range to an analog tape recorder.
It did not quite sell to A & M Records who loved the performance, but decided not to try to lead the recording industry to a new recording standard instead
of Dolby. Dick made many live classical concert and studio recordings via the Noise Eliminator before digital tape became available. Unfortunately the
oxide on analog tapes of that era deteriorated. A few years ago Dick threw out a roomful of these wide dynamic range tapes because he did not want to
spend the rest of his life baking tapes to restore them.
Product literature - Noise Eliminator Model 2000 - August 1972.pdf
Technical description - 110 dB Dynamic Range for Tape - Audio June 1971
AES show report - Doctoring the Signal - E. T. Canby - Audio February 1972
Letter from Eventide to Dick in 1985 regarding the force of his hi-fi system.
Letter on Transient Noise Eliminator, 1978.
Dick designed this device to remove ticks and pops from phonograph records. It was manufactured by KLH Burwen Research.
These files are in Adobe .pdf format. If you do not have the Adobe Reader installed, you can download it for free from Adobe.
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