AT6005

Amplifier Technologies, Inc., the prolific manufacturer of many of the finest high-end amplifiers, today introduced a new series of amplifiers designed by its president and chief engineer, Morris Kessler. The ATI AT6005 amplifier and all AT6000 Signature Series amplifiers, available with 2 to 7 channels, are the company's first new amplifiers in over a decade. Furthermore, its "exclusive series" designation with a facsimile of Kessler's signature on the main panel recognizes the special nature of these designs.

The ATI AT 6005 amplifier and all AT6000 series amplifiers are rated at 300 watts RMS/channel into 8 ohms from 20 Hz to 20 kHz with no more than 0.03% THD with all channels driven and 450 watts RMS into 4 ohms under the same conditions. The ATI AT 6005 amplifier has a signal-to-noise ratio that is typically 128 dB referenced to full output, so each amplifier in the series is capable of reproducing the full dynamic range available in today's lossless recordings. The AT6000 is available in 2- to 7-channel configurations and can be upgraded by adding 300-watt power modules. Each model comes standard with 2 massive toroidal transformers with quick-connect plugs.

Beyond Kessler's personal identification, these amplifiers are new in more significant ways:

1. As with Kessler's previous top-of-the-line designs, these amplifiers are fully balanced differential amplifiers, but unlike their previous balanced designs which were essentially balanced bridged amplifiers, the 6000 Series uses only one input stage with dual differential output stages. The reason: the advantages of balanced designs are maintained and noise is reduced by 50%.
2. The design uses current feedback instead of the more common voltage feedback. The reason: Today's feedback amplifiers are faster, with virtually unlimited slew rate, and can better reproduce today's best music and movies.
3. Kessler used Thermaltrak output devices for the 6000 series. Unlike traditional designs where external diodes connected to heat sinks track the operating conditions of the amplifiers and use the details to adjust biasing, Thermaltrak devices have the diodes in the same package as the transistors. The results: bias is optimized in real time.
4. The 6000 series uses dual DC servos to track and maintain DC offset. The result: the DC at the amplifier output is reduced to negligible levels.
5. These amplifiers use a revised PCB design. They are still modular with the entire amplifier, including the power supply parts, on a single board, but now the AC components are on one edge of the board and away from the signal input. The result: improved signal-to-noise performance.
6. All amplifiers in the series use dual toroidal transformers, dual power switches, and dual line cables. The results: The AT6002 now features a full dual-mono design, and amplifiers with many channels, such as the 7-channel AT6007, can be connected to two independent 20-amp circuits for higher sustained output power than is possible with a single AC circuit. More features