Pioneer SX-1250 Stereo Receiver
The Pioneer SX-1250 is considered by many collectors to be the pinnacle of the "monster receiver wars" era. It is highly regarded for its bulletproof over-engineered build quality and audiophile-grade separate internal components. Technical Specifications The official performance metrics for the amplifier and tuner stages include: Power Output: 160 watts per channel RMS into 8Ω (stereo, both channels driven from 20Hz to 20kHz) / 200 watts per channel into 4Ω Total Harmonic Distortion (THD): < 0.1% at rated power (commonly benches under 0.05% when restored) Frequency Response: 10Hz to 50kHz (+0dB, -1dB) Damping Factor: 30 (at 8Ω) Signal-to-Noise Ratio: 75dB (Phono MM), 90dB (Line/Aux/Tape) Phono RIAA Equalization Accuracy: ±0.2dB Speaker Load Impedance: 4Ω to 16Ω Key Internal Architecture Dual-Mono Power Supply: Features completely independent power stages for each channel, driven by a massive 22-pound central toroidal transformer and shielded rectifiers. "Coke-Can" Capacitors: Equipped with four giant 22,000µF filter capacitors to maintain massive dynamic headroom and stable rail voltage. DC-Coupled Amplifier: Power section uses direct coupling across all output stages without blocking capacitors, yielding tight, natural bass response. Physical Dimensions Weight: 29.2 kg (64.4 lbs) Dimensions: 556mm × 186.5mm × 464.5mm (21.9" × 7.3" × 18.3") Max Power Draw: 1,200 Watts
The Pioneer SX-1250 is considered by many collectors to be the pinnacle of the "monster receiver wars" era. It is highly regarded for its bulletproof over-engineered build quality and audiophile-grade separate internal components.
Technical Specifications
The official performance metrics for the amplifier and tuner stages include:
Power Output: 160 watts per channel RMS into 8Ω (stereo, both channels driven from 20Hz to 20kHz) / 200 watts per channel into 4Ω
Total Harmonic Distortion (THD): < 0.1% at rated power (commonly benches under 0.05% when restored)
Frequency Response: 10Hz to 50kHz (+0dB, -1dB)
Damping Factor: 30 (at 8Ω)
Signal-to-Noise Ratio: 75dB (Phono MM), 90dB (Line/Aux/Tape)
Phono RIAA Equalization Accuracy: ±0.2dB
Speaker Load Impedance: 4Ω to 16Ω
Key Internal Architecture
Dual-Mono Power Supply: Features completely independent power stages for each channel, driven by a massive 22-pound central toroidal transformer and shielded rectifiers.
"Coke-Can" Capacitors: Equipped with four giant 22,000µF filter capacitors to maintain massive dynamic headroom and stable rail voltage.
DC-Coupled Amplifier: Power section uses direct coupling across all output stages without blocking capacitors, yielding tight, natural bass response.
Physical Dimensions
Weight: 29.2 kg (64.4 lbs)
Dimensions: 556mm × 186.5mm × 464.5mm (21.9" × 7.3" × 18.3")
Max Power Draw: 1,200 Watts
