The Plinius SA-103 Class A power amplifier is the successor to the acclaimed SA-100 power amplifier. Enhancements to the SA-103 include dual power transformers with much higher capacity than those in the SA-100, improved power supply filtering, circuit refinements, and advanced energy saving and error detecting logic control.

Input configuration switching allows the SA-102 to be run as a fully balanced mono power amplifier. Two SA-103s operated in this fashion provide 460 watts per channel of pure balanced Class A music.

The SA-103 is constructed in a substantial chassis with huge Plinius designed heatsink extrusions forming the sides of the case. Enhanced cooling flow built in to the amplifier allows it to run cooler while still maintaining the substantial bias current required for Class A operation. The power supply is housed in the base of the unit and is separated from the active signal circuitry by a horizontal internal bulkhead.

Although rated at 125 watts per channel in stereo mode, the SA-103 has a very large current capacity. Difficult loads are driven with ease, although very low efficiency ones in large spaces may need the added power of the Plinius SA-Reference.

Input options allow for Stereo via RCA connectors, bridged mono through RCA connectors, XLR stereo via XLR balanced connectors, or XLR balanced mono. Signal carrying wires are all Siltech brand.

As with all Plinius products the SA-103 is available in both anodised black and anodised silver finishes.

Specifications

Power: 125 Watts RMS 20Hz to 20kHz into 8 Ohms both channels driven from 20Hz to 20kHz.

Bridged/Balanced Mono Output: 460 Watts RMS per channel into 8 Ohms.

Frequency Response: 20Hz to 20kHz � 0.2dB. -3dB at 5Hz and -3db at 70kHz.

Distortion: Typically less than 0.05% THD at rated power, 0.1% THD and IMD worst case prior to clipping.

Saturation: 140 Watts per channel or greater into 8 Ohms. 220 Watts per channel or greater into 4 Ohms.

Current Output: 50A short duration continuous per channel. Fuse protected.

Rise Time: Typically 5 microseconds.

Hum & Noise: 100dB below rated output 20Hz to 20KHz A-weighted.

Input Sensitivity: 0.8V RMS for rated output at 1kHz.

Input Impedance: 47k Ohms

Dimensions: Height 220mm (8.75"), Width 500mm (19.75"), Depth 455mm (18"), Weight 38kg (83lb).

Input Options: RCA Stereo, RCA Bridged Mono, XLR Balanced Stereo, XLR Balanced Mono.