Ultra-Linear-Amplifier

It is fitted with state of the art Audionet ULA (Ultra-Linear-Amplifier) technology, which has received not only world-wide attention but a number of awards. Originally invented for the purposes of medical engineering, this highly complex circuit topology provides cutting-edge, measuring-technical results. Signal impurity remains below detectable levels even under the most strenuous of circumstances, whilst its outstanding feedback damping ensures that the loudspeakers perform at full capacity.

The Cream of the Crop

Every sound-critical point in the AMP VII is fitted exclusively with the finest components procurable worldwide, many of which are custom-made for Audionet. For instance, the filter capacitors are manufactured according to our specifications by specialists in the USA; the bulk of our high audiograde electrolyte capacitors with a silk dielectric comes from a Japanese audio manufacturer. We rely on mica capacitors, insert selected high voltage foil capacitors, deploy high-quality silver-gold alloys for our internal wiring and use the very best connector systems available from the Essen-based firm WBT.

Architecture

The AMP VII sets standards regarding linearity, reflux damping and loudspeaker control. It is magnetically and capacitatively optimized and coherently assembled as a modular multichannel amplifier. This minimizes feedback from magnetic fields and electrical interference rays, thus eliminating as many of the reciprocal influences between the amplification channels as is possible, as well as that between the input, correction and output stages.

The circuit size was radically reduced in order to optimize the high-frequency attributes. The remaining signal paths are kept to a minimum, and are free of sound-critical components such as coils, chokes or relays. All in all, distortion, interference and the damping factor has been reduced to an almost undetectable minimum. The input stages are double-differential pre-stages with monolithic dual FETs. Their gain-bandwidth product exceeds one Gigahertz and is decoupled from the power stages by double-strapping. Each output stage has two power MOSFETs.

The bias current is actively controlled and supplied by a 650 VA toroid-core transformer and high-speed, impulse-stable high-current capacitors with a filtering capacity totalling 50,000 uF. Distortions are compensated locally by a real-time correction stage. The voltages are smoothed as rapidly as possible by optimized discrete MOSFET regulators. A microprocessor-controlled unit with separate power supply monitors DC, HF, temperature and overload. If necessary, it disconnects the AMP VII from the mains supply, thus ensuring absolute operating safety.