Pioneer - SX-1250 - Vintage Stereo Receiver - Serviced

The Pioneer SX-1250 is one of the most celebrated receivers of the 1970s, combining massive power, extensive analog controls, an excellent tuner section, and the classic silver-face and walnut styling that defined Pioneer's flagship components of the era. Rated at an impressive 160 watts per channel into 8 ohms with both channels driven, the SX-1250 was built to comfortably drive demanding loudspeakers while maintaining low distortion and excellent control.

Beyond its powerful amplifier section, the SX-1250 offers dual phono inputs, multiple tape connections, preamp outputs and power amp inputs, extensive tone and filter controls, and connections for up to three pairs of speakers. Its FM/AM tuner, large illuminated analog dial, substantial power supply, and heavy-duty construction make the SX-1250 a true centerpiece for a vintage two-channel system.

This particular SX-1250 is in excellent pre-owned condition and has been professionally serviced at an authorized McIntosh service center. All lamps are fully functional, all potentiometers, switches, and connections have been cleaned, and critical operating points and devices were inspected. The amplifier bias was properly set and the receiver was bench tested under load following service. It is ready to be enjoyed for years to come.

FEATURES:

• Flagship-era Pioneer stereo receiver from the 1970s
• Heavy-duty dual-channel solid-state amplifier design
• Large shielded toroidal power transformer
• Four 22,000µF main filter capacitors
• Built-in FM and AM tuner
• Dual phono inputs for magnetic cartridges
• Connections for up to three pairs of loudspeakers
• Preamp output and power amplifier input connections
• Extensive bass, treble, filter, and listening controls
• Classic silver aluminum faceplate with illuminated analog tuning display
• Walnut veneer cabinet

AMPLIFIER SPECIFICATIONS:

• Power Output: 160 Watts Per Channel RMS into 8 Ohms, Both Channels Driven, 20Hz–20kHz
• Total Harmonic Distortion: Less Than 0.1% at Rated Power
• Intermodulation Distortion: Less Than 0.1%
• Frequency Response: 10Hz–50kHz, +0 / -1dB
• Damping Factor: 30 at 8 Ohms, 20Hz–20kHz
• Minimum Speaker Load: 4 Ohms

PREAMPLIFIER & AUDIO SPECIFICATIONS:

• Phono Input Sensitivity: 2.5mV
• Microphone Input Sensitivity: 6.5mV
• Aux / Tape Input Sensitivity: 150mV
• Phono Overload Level: 500mV
• RIAA Equalization: ±0.3dB
• Phono Signal-to-Noise Ratio: 75dB
• Aux / Tape Signal-to-Noise Ratio: 90dB
• Line / Tape Record Output: 150mV
• DIN Output: 30mV
• Preamp Output: 1.0V

TONE & FILTER CONTROLS:

• Bass Main Control: ±10dB at 100Hz
• Bass Sub-Control: ±5dB at 50Hz
• Treble Main Control: ±10dB at 10kHz
• Treble Sub-Control: ±5dB at 20kHz
• Low-Cut Filters: 15Hz / 30Hz
• High-Cut Filters: 8kHz / 12kHz

FM / AM TUNER:

• FM Tuning Range: 88–108MHz
• AM Tuning Range: 535–1605kHz
• FM Usable Sensitivity: 1.5µV
• FM Capture Ratio: 1.0dB
• FM Harmonic Distortion: Less Than 0.1% Mono / Less Than 0.2% Stereo
• FM Stereo Separation: Greater Than 50dB at 1kHz

SERVICE PERFORMED:

• Professionally serviced at an authorized McIntosh service center
• All lamps checked and confirmed fully functional
• All potentiometers cleaned
• All switches and connections cleaned
• Critical operating points and devices inspected
• Amplifier bias properly adjusted
• Bench tested under load following service

PHYSICAL SPECIFICATIONS:

• Dimensions (W x H x D): 21.87 x 7.34 x 18.31 in.
• Metric Dimensions: Approx. 556 x 186.5 x 464.5 mm
• Net Weight: Approx. 64.25 lbs. (29.2 kg)
• Cabinet: Walnut Veneer Wood Case
• Power Supply: Shielded Toroidal Transformer with Four 22,000µF Filter Capacitors

CONDITION:

Great pre-owned condition, especially considering the age of this vintage receiver, with minimal signs of previous use. The unit has been professionally serviced, properly adjusted, and bench tested under load as detailed above. Please review all photos carefully for the exact cosmetic condition and everything included.