PIONEER A-20-K 50W Stereo Amplifier with Direct Energy Design and Aluminium Panels (Black) 3 Years waranty

Main Features

Output Power per Channel50W
Impedance at Output Level• 4 Ω - 16 Ω (A / B)
• 8 Ω - 32 Ω (A + B)
• 4 Ω - 16 Ω (Bi-wiring)
Number of Channels2
Input Connections• SACD/CD
• Phono (MM)
• Aux
• Network
• Recorder
• Tuner
Output Connections• Recorder
• Phones
Remote ControlYes
Input & Output connections
HeadphoneYes
Large speaker terminalsYes
Phono InputYes
Speaker A/BYes
Audio Features
Bass/Treble Tone ControlsYes
'DIRECT' SwitchYes
Loudness (+)Yes
MutingYes
Source DirectYes
Power Output
Power output per channel50 W
Condition20 Hz - 20 kHz, 4Ω, 0.1 % КНИ
Rated Power Output50 W per channel
Power RequirementsAC 220 - 230 В / 50 Гц
Power Consumption (in use / standby)135 W / 0.30 W
Auto Power DownYes

Construction
Direct Construction (+)Yes
Design- Direct Energy Design Amp
- Symmetrical Power Amp
- Clean Ground Construction
- Isolated Power Supply
- Source Direct Mode
- Trans-Stabiliser
- Speaker A, B, A+B Selector
- Aluminium Panels
- Auto Power Down
Amplifier Specifications
Dimensions (W x H x D)435 x 128 x 360  mm
Weight7.2 kg

High rigidity metal frame
Shielded high current power supply
• 500VA toroidal transformer
• 80.000uF capacitor bank
• Rubber insulated aluminium feet
• WBT connector on unbalanced input
• Neutrik connector on balanced input
• Fully discrete analogue design
• Onsemi MJL1302/3281 power transistor
• Low overall feedback
• High stability on capacitive loads
• White Gold cable on output connection
• 100W/8Ohm power unit and double the
power on 4 Ohm until 390W on 2Ohm; a
big power reserve that allows to drive any loudspeakers even in a big room.

Τi 60 tube
Integrated tube amp.Four line inputs.
2X12AU7, 4x EL34, 1x12AX7
35 Wrms per chan.4-8 ohm.
Class AB push-pull
Remote control included.

Designed for excellent sound quality, with a beautiful appearance.
An integrated amplifier with the advantage of digital input.

    ToP-ART (Total Purity Audio Reproduction Technology) and high quality parts
    - I/O (input to output) Direct Symmetrical Design
    - ART (Anti-Resolution and Tough) Base
    - Custom-made power transformer / 6,800uF block capacitors / Aluminum-extruded heat sinks
    95W x 2 (max), 60W x 2 (RMS) high power output
    Pure Direct Mode for Greater Sound Purity
    Continuous Variable Loudness Control
    Digital audio inputs for TV or Blu-ray Player
    Connection for YBA-11 Bluetooth Wireless Adapter
    Simple yet sophisticated design (aluminium front panel and knobs)
    Auto Power Standby

Technical Specifications

Continuous power output, per channel, 8Ω

• Both channels driven, 8Ω,20Hz-20kHz, 0.2% THD - 200W
• Single, 4Ω, at 1kHz - 400W

Inputs

• Nominal sensitivity  for 200W / 8Ω - 1.15V (RCA), 2.3V (XLR)
• Input impedance - 10kΩ
• Frequency response 20Hz-20kHz +/- 0.05dB
• Signal/noise ratio (Awtd) 50W / 8Ω - 110dB

General

• Power consumption (standby) -

The 851W has class XD amplification at 200W into 8 Ohms in stereo mode or 500W RMS per amp in mono bridged mode, separate toroidal transformers for the power amp and input/other circuitry, and terrapin impedance buffering modules. All in all it\'s the best sounding amplifier we have ever made.

         Our proprietary Class XD amplification
        Separate toroidal transformers for power amp and input/other circuitry
        Our bespoke Terrapin impedance buffering modules – separating amplifier and signal impedance
        200W into 8 Ohms stereo mode or 500W RMS per amp mono bridged mode
        CAP5 protection from DC spikes, overheating and clipping
                All metal chassis with premium components
        Remote Control – Compatible with the entire 851 range

 Power output – stereo/mono    200W per channel into 8 Ohms
350W per channel into 4 Ohms
Power output – bridged mono    500W 8 Ohms
800W 4 Ohms
THD (unweighted)    < 0.001% 1 kHz
< 0.005% 20 Hz - 20 kHz
Frequency response    5Hz – 80kHz
S/N ratio (ref 1W / 8 Ohn)    >90dB (unweighted)
Sensitivity – stereo or mono    1.5V rms unbalanced
1.5 + 1.5V rms balanced
Sensitivity – bridged mono    0.775V rms unbalanced
0.775V + 0.775V rms balanced
Input impedances    Balanced input 38 kOhm
Unbalanced input 68 kOhm
Power amp damping factor    > 110 at 1 kHz
Max. power consumption    2400W
Standby power consumption    Standby