"The unit operates in pure class A over a very large
power band and beyond in class AB. Each of the output
stages is based on tandem MOSFET transistors of
exceptional characteristics. Generally, 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 characterised by its stability, irrespective of the loads placed upon it. 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, used to actively correct the power factor. The filtering is achieved with a bank of capacitors, totalling 300 000 μF.
Designer and manufacturer of Nagra products
This supply concept, which ensures efficient energy transfer, allows immediate reaction on even the most abrupt transients."