Features Generally, the assembly of an equivalent output stage requires several pairs of transistors, which is difficult to achieve precisely. The simplicity of the CLASSIC AMP’s design is the key to its musicality. The input and driver stages also contribute equally to the overall performance and precision. The Nagra CLASSIC AMP is characterized by its stability, irrespective of its loads. The power circuits drew particular care in the design stage. They are based upon an innovative concept: An over-dimensioned transformer and a diode bridge are placed upstream of the PFC decoupling stage, and used to correct the power factor actively. The filtering is achieved with a bank of capacitors, totalling 300 000 μF. This supply concept ensures efficient energy transfer and allows immediate reaction on even the most abrupt transients. The Nagra CLASSIC AMP is fitted with a traditional Nagra Modulometer on the front panel, showing the power of each output channel. An LED is also fitted to indicate saturation and excessive temperature. The amplifier is equipped with balanced and unbalanced inputs and an IN/OUT trigger function. It can be used in a bridged configuration, giving 1x 200 W into 4 Ω, and can also be used in a bi-amplification configuration if desired. Technical specification ELECTRONICS Power: 100 W RMS per channel into 8 Ω Sensitivity: 1 V or 2 V RMS Bandwidth: 10 Hz to 80 KHz, +0/-3 dB Crosstalk: >70 dB Signal-to-noise ratio: Typically 110 dBASA “A” weighted THD+N: < 0.05% Input impedance: >100 KΩ Automatic start: For input level >10 mV Protection: Overheating > +60° C (140° F) deactivates the amplifier: DC speaker protection above ± 2.5 VDC GENERAL Consumption: 400 W maxless than 1 W in standby and Auto mode Weight: 18 Kg (39 lb 10 oz) Size: 350 (400 from the nose of the modulometer to the back of the connectors) x 277 x 165mm (15.7 x 10.9 x 6.5 inches) – Add 3cm or 1.2 inches with a VFS plate placed under Operating range: 90 – 110 V or 110 -132 V or 180 – 264 V a.c.50 – 60 Hz
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