Daniel R. von Recklinghausen


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D.R. von Recklinghausen in Koss Pro-4A headphones"While no one person is ever responsible for a major new technology, Daniel von Recklinghausen, Scott's chief engineer, was certainly a major force in the development and popularization of FM radio. von Recklinghausen, unlike his contemporaries, still has designs that are in the forefront of current state-of-the-art audio technology. The EMlT tweeter, which can be found in some of the finest systems in the world was designed by von Recklinghausen. KLH first marketed it as the DVR tweeter.

von Recklinghausen was, and is, a rare breed of audio engineer -- one who uses his ears and has an open mind. A quote from a Boston Audio Society meeting best illustrates his philosophy:

"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing."

This is the kind of dedication to sound quality that is only found today among High End manufacturers. For von Recklinghausen the sound of music was the reference."

Editor's Note: This text first appeared in TAS, Volume 12, Issue 50, pg. 83-85, The (Golden Age) Antique Collector: part 1. Reprinted with the permission of the Editor-in-Chief of The Absolute Sound, the (only) High End journal about music and sound.


Major Contributions of
 Daniel R. von Recklinghausen
 for H.H. Scott vacuum tube products

1953 First integrated (complete) high fidelity amplifiers, including the first low, flat (slim-line design) high fidelity amplifier (Type 99A and the 210-C). This "Packaged-Engineering" accomplishment brought hi-fi off the workbench and into the living rooms of "fifties" America.
1954 First commercially successful use of wide-band circuitry in high fidelity FM tuners (Type 310 Broadcast Monitor). This was a major step forward in the popularization of FM broadcasting, as a "serious" source component in hi-fi systems.

First Phonographic turntable to feature Stroboscopic, variable-speed control and acoustical isolation of the platter motor and tonearm assemblies.


First high fidelity AM/FM tuner using wide-band AM design (Type 330). This made possible the concept of  Simulcast Stereo, laying the ground work for true FM multiplex stereo.


First supersonic cutoff filter (eliminates beat interference) for "flawless" tape recording from FM broadcast sources.


First stereo receiver, incorporating an integrated (mono) preamp with Simulcast Stereo AM/FM tuner, (Type 331)

1957 First stereo control center (Type 135), designed to preserve customers' investment with existing monophonic equipment, but permit convenient, one-source control of multiple components.
1958 The first stereo preamplifier (Type 130)
1958 First integrated (complete) stereo amplifier (Type 299)
1958 First integrated stereo amplifiers to provide derived center channel outputs (Type 299)
1958 First stereo auto- balancing amplifier circuitry (Type 299)
1960 First stereo receiver, incorporating an integrated (stereo) amplifier with Simulcast Stereo AM/FM tuner, (Type 399)
1960 First FM Tuner (Broadcast Monitor) with diversity antenna option and high-speed, low-distortion,  DYNAURAL inter-station muting (Type 310-D)
1960 First Stereo Preamplifier (Type 122) incorporating "DYNAURAL" Noise
1960 First easy-to-build, attractively packaged audio kits. Featured innovative, fool-proof, four-color, fold-out diagrams and  "Parts-Charts and Scott Kit Paks." ScottKit products included:

The first Wide-Band FM Tuner Kit (LT-10) featuring EZ-A-lign method (Eliminated need for special RF alignment instruments).

The first (stereo) Preamplifier kit (LC-21) with derived center channel output

The first Integrated (stereo) amplifier kit (LK-72) employing "split-load" phase-inverter circuitry derived center channel output

The first basic (stereo) amplifier kit (LK-150) employing "split-load" phase-inverter circuitry and derived center channel output

1960 Introduction of "Controlled-Impedance," acoustic-suspension, speakers.
1961 First wide-range consoles without acoustic (turntable) feedback -- "IsomounT system."
1961 First FM multiplex signal generator (Type 830), employing the FCC-approved (Zenith/GE-system) stereo FM-multiplex transmission system.
1961 First FM multiplex adaptor (Type 335) using "time-switching" (a.k.a Time Division Multiplexing or TDM) circuitry providing maximum separation, low-distortion and "flawless"  off-the-air tape recording of FM Stereo broadcasts.
1961 First FM multiplex stereo tuner (Type 350) using "time-switching" circuitry.
1962 First to introduce the "Sonic Monitor"  feature (Type 350-B), for positive, reliable (audible) identification and precision-tuning of FM Stereo Multiplex broadcasts. First Stereo FM-Multiplex Tuner (LT-110) Kit introduced.
1962 First to introduce an Auto-Sensing, Switching and Indicating FM-Multiplex Tuner (Type 4310 Broadcast Monitor), with separate, stepped-level (volume) controls and VU meters for exact channel-level matching.

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