Panasonic SU-V900: Integrated amplifier

As a power amplifier component in the SU-V900, the tone-quality design know-how of a digital direct drive is used. The power amplifier portion, which formerly consisted of a single unit, now consists of two units: a class AA power amplifier with voltage amplification of 1 (0dB) and a flat amplifier with voltage amplification of 30dB.

The 0dB power amplifier has excellent transmission qualities, including a low noise level, allowing it to avoid voltage amplification. The 0dB amplifier's operational stability is achieved by combining the original classAA circuitry, which shares voltage management and an electric-current control with a separate amplifier, and a floating power source.

By placing a 30dB flat amplifier in the shielding case of a preamplifier part, it has prevented the excessive current of a power amplifier part output stage from having an adverse influence on a power amplifier part input stage.
These stream compositions have excelled by achieving super-low distortion and speaker driving capacity at the same time.

The right-and-left independence of the mass transformer of 170VA is carried in the power-source component. This transformer is encased with a resin shielding case and employs an oxygen-free-high-conductivity-copper line to reduce equipment oscillation and magnetic radiation. Lower the amplifier's input stage by attaching it.

The electrolytic capacitor contains the newly developed X-Pro dual capacitor. This capacitor disables two electrolytic capacitors for power sources, one on each side, in a resin box with a copper cap, and the equipment oscillation and electromagnetic radiation are decreased by packing vibrational absorption material.

The power amplifier section used a twin monophonic stream composition, which divided and organized the right and left channels. Having a T-type stream composition that severely insulated the preamplifier part reduces cross-interference between the right-and-left channels by electromagnetic waves from a big current of a power amplifier component.

Furthermore, a hard-to-vibrate chassis construction is used, such as putting the power amplifier on either side of the board bending the chassis of 2mm thickness independently, and also fixing the darkroom and a rear surface board by two center angles.

Electrical machinery and magnetic noise are dealt with by attaching a severe shielding board to the input unit.

Each component is made up of parts such as a high purity OCC wire rod and a PXS electrolytic capacitor.

Using the direct functionality of the power amplifier, a simple connecting of a signal line — high-purity signal transmission is realized.