SCA2

The SCA 2 preamplifier was initially conceived to fulfil a specific need - to create a no-compromise amplifier to partner the range of ATC active loudspeaker systems. However, as development progressed it became abundantly clear that the SCA 2 preamplifier was capable of enhancing the performance of any audiophile separates system.

In fact, the outstanding ability of the SCA 2 left many who auditioned the final pre-production prototype in no doubt that they were listening to possibly the finest example of preamplifier design - ever.

A key feature of the SCA 2 is the total elimination of audio integrated circuits in the main signal path which is made possible through the introduction of no fewer than ten high performance discrete circuitry gain blocks. Furthermore, all amplifiers in the monitor chain are of similar type and built from discrete bipolar transistors and FETs. The input stage is a fully complimentary dual long tail pair arrangement which uses low-noise bipolar transistors with constant collector voltages provided by cascoded junction FETs. Output of the current mirrors is buffered by a pair of complimentary Sziklai Darlington transistors. To further minimise signal degradation, input circuitry including all sockets, selection relays and tape buffer is mounted directly onto a single PCB.