The amplifier is provided with a 2-mm steel housing and an aluminum front panel of 6-mm thickness. It has an economic height 2U!
The circuit topology of the amplifiers of this series combines the advantages of classes A and G, thus providing high linearity and efficiency, small heat dissipation and boosted reliability as a consequence. The signal path consists of the voltage amplifier and current amplifier whereas the total negative feedback is absent. The voltage amplifier is based on the tracking cascode circuit which works in a pure class A, hence the sensible distortion are reduced to the zero. The current amplifier has a complementary circuit consisted of bipolar transistors Sanken which works in a dynamic class A. A high efficiency is achieved owing to three-level power supply (class G) with power control by means of N-channel MOSFETs.
The effective cooling system is used, wherein the transistors are provided with fluted heatsinking and the air stream cools all of them simultaneously. "Dual mono" units are taken as a basis of configuration. Audiophile circuitry and handiwork technology ensure high reliability, perfect characteristics and excellent quality of sounding. The effective protection against overload (Overload Protection) as well as a high-speed solid-state thyristor circuitry of protection of the loudspeakers reduces the risk of their damage to the zero. Furthermore, protection from RF, infra-low frequencies, from a short circuit and a constant voltage on an output, from overheat of output stages and transformers, from an overload on an input up to +15 dB are also available. A delay and smooth rise of a signal at turn-on are also provided. A circuit of smooth connection to the mains is operating.
The amplifiers of series NA Neva Audio can be used for tours, installations in studios, theatres, cinema-halls, disco-dance clubs and making the sound of the living concerts.