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The Pioneer A-27 (international market) integrated amplifier, also known as the A-0012 (Japanese market) was first introduced in Japan in 1977. It was part of the Pioneer Series 20 line. It is a Class AB integrated amplifier, with Class A operation up to 30W and it has a continuous power output of 120 watts per channel into 8Ω. The pre-amplifier and power amplifier can be separated. It was considered a high-end amplifier at the time of its release and is still highly regarded today. The front panel features a user-friendly design, with the main functions located at the top and secondary functions housed in a hinged smoked-glass sub-panel below. The power amplifier section, like the separate M25, boasts a Magni-Wide Power Range concept, providing ample power even at ultra-high frequencies and improving quality within the audible frequency range. To improve sound quality at low volumes, the A0012 employs pure Class A operation at outputs below 3W, gradually approaching Class B operation at (30W) rated output. This is a common feature of the series. Another notable feature is the signal-to-noise ratio of the MC head amplifier equalizer, which has been carefully optimized to match the cartridge's performance. In terms of functionality, notable features include the Pioneer-style twin control with 1 dB steps, an audio muting switch for directly connecting the DC-configuration equalizer section and power amplifier section, and a function display indicator. The power supply consists of a large left and right independent transformer with an emphasis on dynamic characteristics and a 18,000 μFx4 capacitor. The whole MC head amplifier section for turntables is divided into two systems. The first stage parallel connection symmetrical 3-stage direct-coupled A-class SEPP-DC amplifier is composed of two newly developed low-noise NPN and PNP transistors connected in parallel. It is designed to improve linearity when NFB is not applied by focusing on bare characteristics. In addition, the SN ratio is improved by adopting symmetrical circuit configuration.
Specifications:
Continuous power Class AB (Class A operation up to 30W)
8 Ohm: 2 x 120W (5Hz - 30kHz, THD 0.01%)
4 Ohm: 2 x 120W (5Hz - 20kHz, THD 0.02%)
Total harmonic distortion: 0.01%
Dimensions: 454 x 167 x 468 mm (WxHxD)
Weight: 24.7 kg
Original sale price in Germany: 3.200 DM
.jpg "PIONEER A-0012/A-27 | Class AB Integrated Amplifier")
.jpg "PIONEER A-0012/A-27 | Class AB Integrated Amplifier")
.jpg "PIONEER A-0012/A-27 | Class AB Integrated Amplifier")