The Dynaco Stereo 80 is a solid-state stereo power amplifier delivering 40 watts per channel into 8 ohms. It integrates two independent amplifier channels on a single chassis with a shared power supply, designed to work with external preamplifiers, tape recorders, or tuners. The amplifier employs an all-silicon transistor design comprising 12 transistors and 10 diodes, engineered for low distortion and musical reproduction across the audio spectrum.
Technical Specifications
Output Power
• 40 watts per channel into 8 ohms
• Approximately 42 watts per channel into 8 ohms at 0.5% THD
• 25 watts per channel maximum into 4-ohm loads
• 14 watts per channel maximum into 16-ohm loads
Frequency Response
• 10 Hz to 50 kHz ±0.5 dB
• 8 Hz to 50 kHz at half output into 8 ohms, less than 0.5% THD
Distortion Performance
• Harmonic distortion less than 0.5% at any power level up to 40 watts per channel into 8 ohms, 20 Hz to 20 kHz
• Intermodulation distortion less than 0.1% at any power level up to 40 watts per channel
• Typical THD + Noise: 0.002% at 1 kHz, 40 watts, 8 ohms
Electrical Characteristics
• Noise floor: 90 dB below rated output
• Damping factor: greater than 40 from 20 Hz to 20 kHz
• Channel separation: more than 60 dB from 20 Hz to 10 kHz
• Input sensitivity: 1.3 V for 40 watts into 100 kΩ
• Input impedance: 100 kΩ
• Adjustable input sensitivity available: 0.5 V to 5.5 V
– Key Features
• Conservative component selection and tight tolerances for reliable operation
• Patent-pending automatic protection circuits against misuse
• All-silicon transistor construction
• Low intermodulation distortion (measured at 0.06% with 19 and 20 kHz test tones)
– Compatibility & Integration
• Compatible with 4-ohm, 8-ohm, and 16-ohm speaker loads
• Requires external preamp or source with integrated volume control
• 100 kΩ input impedance accommodates standard line-level sources
