In this new A-19 the input circuit consists of a symmetrical differential circuit. That part is controlled using constant current sources. The second stage of the voltage amplifier forms a current mirror with the input circuit. All semiconductors in the voltage amplifier are bipolar transistors. This way of configuring results in an extremely linear amplifier circuit.

The current amplifier holds four power fets configured as source followers. No source resistors are used.

The linearity of the entire amplifier avoids the need of an overall feed back in order to compensate for non-linearities. We did use some (very little) feed back with the sole purpose to lower the output impedance.

Both channels each have their own power supply circuit. Per channel there's 60.000 µF of buffer capacity.

The major part of the amplifier is pre-mounted using SMD technique. All resistors, capacitors, diodes and transistors are mounted this way so the d-i-y builder has very few to add.

The heatsinks are an integral part of the cabinet, located at both sides.

Apart from some soldering 19 holes have to be drilled.

Specifications: