Conrad-Johnson's design philosophy is the culmination of more than 40 years of research and development. Their products are executed with simple circuits, constructed with the highest-quality custom components, and benefit from the use of proprietary components, military-grade parts, and in-house designed elements—all sourced from North.. Conrad Johnson tube amplifiers, preamps, solid state amplifiers. Deja Vu Audio 703.734.9391 New address: 8450B Tyco Road, Vienna, Va 22182. The most important legacy of conrad-johnson design's beginnings is the basic methodology which took shape in the course of the development of that first preamplifier. This methodology has enabled Conrad.
The resulting conrad-johnson preamplifier was immediately recognized as a state of the art contender and catapulted Conrad and Johnson into the audio industry. The most important legacy of conrad-johnson design's beginnings is the basic methodology which took shape in the course of the development of that first preamplifier.. Our design philosophy is the culmination of more than 40 years of research and development. conrad-johnson products are executed with simple circuits, constructed with the highest-quality custom components.