Pionner Stereo Amplifier A-402

Description

The Pioneer A-402 is a vintage integrated stereo amplifier that was likely produced in the early to mid-1990s. It's known for offering a solid build quality, reliable performance, and a clean, powerful sound, making it a popular choice for both casual listeners and those seeking a capable amplifier for a more serious hi-fi setup.  

• Integrated Design: As an integrated amplifier, the A-402 combines the preamplifier (for input selection and volume control) and the power amplifier (to drive speakers) into a single unit. This simplifies setup and can often provide a more direct signal path compared to separate components.
• Power Output: Typically, the A-402 delivers a respectable power output. Based on available information for the similar A-402R model, it likely provides around 60 Watts per channel into 8 ohms and 80 Watts per channel into 4 ohms. This is sufficient power to drive a wide range of bookshelf and floorstanding speakers.
• Multiple Inputs: The A-402 is equipped with various analog inputs to connect different audio sources. These usually include:
  • Phono (MM): For connecting a turntable with a moving magnet cartridge.
  • Tuner: For a radio tuner.
  • CD: For a compact disc player.
  • Line/Aux: Several additional line-level inputs for other devices like tape decks, auxiliary players, or streaming devices.
  • DAT/Tape: Inputs and outputs for connecting tape recorders or digital audio tape decks.
   
• Tone Controls: The amplifier typically features bass and treble controls, allowing users to adjust the tonal balance of the sound to their preference or to compensate for room acoustics or speaker characteristics.
• Loudness Function: A loudness switch is often included to boost the bass and treble frequencies at lower listening levels, compensating for the human ear's reduced sensitivity to these frequencies at lower volumes.
• Direct/Line Straight Mode: This feature bypasses the tone control circuitry, providing a more direct signal path from the input to the power amplifier. This can result in a cleaner and more accurate sound reproduction, favored by purists.
• Speaker Outputs: The A-402 usually offers connections for two pairs of loudspeakers (A and B) . This allows users to switch between two different sets of speakers or run them simultaneously.  
• Headphone Output: A standard 1/4" (6.3mm) headphone jack is typically present on the front panel for private listening.  
• Remote Control (Likely for A-402R): While the base A-402 might not have included a remote, the A-402R version does feature remote control functionality for volume and input selection.
• Solid Build Quality: Pioneer was known for its robust construction during this era. The A-402 likely features a well-damped chassis to minimize vibrations and ensure reliable operation.

Specifications (Based on available information for the A-402R, may vary slightly for the base A-402):

• Power Output:
  • 60 Watts per channel into 8 ohms (20Hz - 20kHz, 0.07% THD)
  • 80 Watts per channel into 4 ohms
• Frequency Response: 5Hz to 100kHz
• Total Harmonic Distortion (THD): 0.07% at rated power
• Input Sensitivity and Impedance:
  • Phono (MM): 2.5 mV / 47 kΩ  
  • Line: 150 mV / 47 kΩ
• Signal-to-Noise Ratio:
  • Phono (MM): 87 dB
  • Line: 106 dB  
• Speaker Impedance: 4 - 16 ohms
• Dimensions (W x H x D): Approximately 420 x 125 x 360 mm  
• Weight: Approximately 6.7 kg - 8.1 kg (depending on the exact model)  
• Power Consumption: 440W (maximum)