4 kanálový predzosilovač Pioneer QC 800A

Here are the technical specifications for the Pioneer QC-800A, a quadraphonic preamplifier designed for high-fidelity four-channel audio systems:
📻 General Information
• Manufacturer: Pioneer Corporation, Tokyo, Japan
• Model Years: 1971–1972
• Type: Quadraphonic preamplifier / audio mixer
• Purpose: Processes discrete 4-channel signals and synthesizes quadraphonic effects from stereo sources
• Companion Unit: Pioneer QM-800 quadraphonic power amplifier
⚙️ Technical Specifications
• Power Supply: AC 110V / 120V / 130V / 220V / 240V (selectable), 50/60 Hz
• Power Consumption: 5 W (max)
• Dimensions: 430 × 145 × 337 mm
• Weight: 7.6 kg (16.74 lb)
• Cabinet Material: Wood (bookshelf-style unit)
🎧 Audio Performance
• Frequency Response: 10 Hz – 70 kHz ±1 dB
• Total Harmonic Distortion: < 0.05% (at 2V output)
• Signal-to-Noise Ratio (IHF):
o Phono: > 80 dB
o Tuner/Aux: > 100 dB
• Channel Separation (1 kHz): > 50 dB
🔌 Inputs & Outputs
• Input Sensitivity / Impedance (1 kHz):
o Phono 1 & 2: 4 mV / 50 kΩ
o Tuner, Aux 1 & 2: 250 mV / 180 kΩ
o Tape Monitor 1 & 2: 250 mV / 220 kΩ
• Recording Output (Tape Rec 1 & 2): 250 mV (4-channel, pin jack)
• Preamp Output: 2.5 V nominal, 4 V max
• Load Impedance: > 10 kΩ
• Output Impedance: < 5 Ω
• Headphone Jacks: CH. 1 & 3, CH. 2 & 4
🧠 Internal Components
• Semiconductors:
o 4 × FETs
o 32 × Transistors
o 3 × Diodes
🛠️ Additional Features
• Filters:
o Low Filter: –8 dB at 50 Hz
o High Filter: –8 dB at 10 kHz
• Equalization Curve: RIAA standard
• Muting Function: –20 dB attenuation
• Quadralizer: Synthesizes quadraphonic effects from stereo sources
This unit was part of Pioneer's early push into quadraphonic audio, offering both discrete and synthesized four-channel sound. If you'd like, I can help you find the user manual or connection diagrams for vintage setups2.