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T+A AMP 8 Stereo Power Amplifier

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AMP 8 High End Power Amplifier

In order to take full advantage of the enormous sound quality of the DAC 8 DSD, an extremely good amplifier is required, which is uncompromisingly constructed and equipped. This is why the AMP 8 is based on the circuit and design technology of our HV and R-series amplifiers. The design is fully symmetrical and the output stages are equipped with high-performance ThermalTrakTM audio transistors. A cleverly programmed mikro-processor monitors the AMP 8 and controls the protection circuit, which switches of the output relay in case of a short circuit, overheat and overload.
One must not be deceived by the small housing size, the AMP 8 can deliver due to its extremely stable power supply more than 100 watts of continuous output power in the highest quality. The slow-running cooling fan is silent, and is controlled by the micro-processor according to load and temperature. The AMP 8 sounds sensational: vigorous, dynamic, high-resolution yet delicate, subtle and audiophile. The combination of DAC 8 and AMP 8 sets new standards far beyond its price class.

Technology


The overall circuit design of the AMP 8 is that of our sensational PA 3000 HV integrated amplifier, which is why the input stage and the voltage amplifier stage operate at much higher voltage potentials (HV - High Voltage concept). The input stage is a cross-coupled J-FET cascode amplifier, while the voltage amplifier stage is a single-ended Class-A Hawksford FET cascode. The output stage is responsible for current amplification, and is equipped with ThermalTrak™ high-performance audio transistors to ensure that the bias point is totally stable and free of inertia effects. The voltage amplifier stage and the current amplifier stage are completely separate from each other, and each has its own power supply. This prevents any feedback effects from the loudspeakers influencing the voltage amplifiers, which are crucial to sound quality. We call this circuit concept ICA (Isolated Current Amplifier), and developed it years ago for our R-series of equipment. The individual stages are of extremely linear, broad-band design, with the result that the AMP 8 requires very low levels of “overall” negative feedback; the bandwidth is more than 200 kHz! Our engineers have invested tremendous effort in creating a circuit track layout with absolutely minimal inductivity, thereby helping to achieve superb transient and dynamic response.
At those points in the circuit which are crucial to sound quality we employ carefully selected audiophile components such as amagnetic Vishay resistors and special WIMA and ELNA audio capacitors! The mains power supply is designed to cope with extremely severe and difficult loads. Its torroidal transformer generates up to 400 Watts whilst maintaining low leakage fields, and is capable of driving even very demanding loudspeakers effortlessly. The power supplies for the amplifier stages are completely separate for each channel, and feature their own reservoir capacity and buffering. In consequence there is no trace of interaction of any kind between the channels.

Specifications


Output Stage

 

Nominal output per channel into 8 Ohms / 4 Ohms
80 Watts / 110 Watts
Peak output per channel into 8 Ohms / 4 Ohms
100 Watts / 130 Watts
Frequency response + 0 / – 3 dB
1 Hz – 200 kHz
Slew rate
60 V/µs
Damping factor
> 170
Signal to noise ratio
> 103 / 110 dB
Channel separation
81 / 65 dB
Total harmonic distortion
< 0,009 %
Reservoir capacity
33.000 µF

Mains / Accessories / Dimensions

 

Mains
110-120 V or 220-240 V, 50-60 Hz. 400 Watts
Standby
< 0,2 W
Additional features
Triggerinput +5 ... 20V for external switching on
Automatic signal-controlled power on
Dimensions (H x W x D)
9,5 x 27 x 27 cm
Weight
7 kg
Finish
Case black aluminium 42, cover silver aluminium 43
Technical modifications reserved

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