Pioneer SX-1980 270-Watt Stereo Solid-State Receiver (Fully Serviced)

Description

Super clean condition, classic amplifier for the serious Pioneer collector or hi-fi junkie! Just fully serviced by Appliancehot. Includes original box as pictured!

Pioneer SX-1980 (#440S): service. PNP regulator (previously replaced) shorted emitter to collector and latched up to main supply rail (no regulation), replaced; shorted B- regulator driver shorted, pre-driver open, both replaced; previously installed supply rail resistor for B- regulator incorrect (4.7 ohm installed where 5.6 ohm should be), both it and complimentary B+ feeder resistor replaced (metal film flame-proof installed; entire pre/post regulation stages recapped for EQ amp (phono pre), tone amp, flat amp, filter amp stages, AM, FM, I.F. and MPX stages and DC driven illumination (all fresh Nichicon); entire protection/load connect delay circuit re-capped (all fresh Nichicon); all pots and switches cleaned and rinsed including null trims, bias trims and rear apron sensitivity selector and RF filter for phono; load disconnect (speaker relay) contacts re-surfaced and contacts treated to prevent oxidation (all 8); all scale lamps replaced as complete set with correct incandescent type; tuning capacitor shaft brushes surfaced and shaft oiled (synthetic); reduction gear assy oiled (synthetic); all tuning string pulleys oiled (synthetic); partially seized tuning knob shaft degreased and polished, sleeve nylon honed and oiled (synthetic), run-out set; dial aligned physically to index “0” with tuning capacitor fully closed; front end R.F. stage oscillator aligned to be linear with tuned frequency for AM and FM; I.F. stages peaked; discriminator transformer re-aligned; MPX decoder aligned for proper stereo delivery and suppression of pilot; output stage nulled to 0mV after thermal stabilisation, cover in place (final was +/- 1.4mV); output stages biased at 10kHz into 4 at 1w output, and all x-over notch eliminated; meters electrically aligned to represent actual output voltage (wattage) relative to 8 ohm loading, averaged mid-scale at 400Hz and 1kHz. All functions operating as designed, including phono.

Features:

• 270-Watt Output: Delivers a massive 270 watts per channel (at 8 ohms) for high power, ideal for driving large speaker systems and providing dynamic, distortion-free sound at any volume.
• Fully Serviced and Restored: The unit has been professionally serviced and restored, ensuring all components are functioning optimally and it is in like-new condition, ready for immediate use.
• Classic Pioneer Design: Featuring a robust brushed aluminum front panel with vintage-style meters, the SX-1980 is both a functional audio component and a visual centerpiece in any audio setup.
• FM Multiplex Tuner: Provides excellent reception and fidelity, with a built-in FM tuner that is capable of tuning both mono and stereo FM signals for high-quality radio listening.
• High Power Output: Capable of handling speakers with a wide range of impedance (4-16 ohms), providing flexibility in speaker matching.
• Advanced Circuitry: Incorporates a high-damping factor to improve transient response and minimize distortion, ensuring clean and accurate sound reproduction.
• Multiple Inputs/Outputs: The SX-1980 features a variety of audio inputs and outputs, making it compatible with various audio devices such as turntables, CD players, and tape decks.
• Vintage Audio Appeal: A true collector’s piece for those who appreciate classic audio equipment, combining the retro look and feel with modern-day reliability and sound quality.

Specifications:

• Model: Pioneer SX-1980
• Year of Manufacture: Originally released in the late 1970s
• Amplifier Type: Solid-State Stereo Receiver
• Power Output:
  • 270 watts per channel at 8 ohms (stereo)
  • 320 watts per channel at 4 ohms
• Total Harmonic Distortion (THD): 0.003% (extremely low, ensuring clear and accurate sound)
• Frequency Response: 20 Hz – 20 kHz (+/- 0.5 dB)
• Signal-to-Noise Ratio: 100 dB (A-weighted)
• Damping Factor: 50 (ensures tight control over speaker movement and improved bass response)
• Inputs:
  • 4 x Stereo Line Inputs
  • 1 x Phono Input (for turntables)
  • 1 x Tape Input/Output
  • 1 x Auxiliary Input
• Outputs:
  • 1 x Speaker Output (for multiple speaker connections)
  • 1 x Tape Output
  • 1 x Headphone Jack (1/4”)
• Tuning Range: FM (88 MHz – 108 MHz), AM (530 kHz – 1,710 kHz)
• FM Sensitivity: 1.8 µV for 30 dB S/N ratio
• Dimensions: 18.5” x 7.5” x 18.5” (W x H x D)
• Weight: Approx. 50 lbs (22.7 kg)
• Power Supply: 120V AC (USA market version)
• Construction: Metal chassis with a brushed aluminum front panel and wooden side panels
• Meters: Signal strength and tuning meters
• Audio Inputs/Outputs:
  • 2 x sets of speaker terminals (A & B)
  • Tape monitor loop
  • Phono, auxiliary, and tuner inputs

The Pioneer SX-1980 270-Watt Stereo Solid-State Receiver is a legendary powerhouse that provides audiophiles with exceptional sound quality, power, and versatility. As a fully serviced model, it has been meticulously restored to ensure optimal performance, making it an ideal choice for both vintage audio enthusiasts and modern users who seek a reliable, high-performance receiver. Whether you’re looking to drive high-impedance speakers or simply want to enjoy the warmth and clarity of vintage sound, the Pioneer SX-1980 offers unparalleled audio fidelity and a classic design that stands out in any collection.