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.
Key Features and Characteristics:
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)
