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TECHNICS SE-9060 amplifier - $300 (Allentown)
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Specifications
Power output: 70 watts per channel into 8Ω (stereo), 180 watts into 8Ω (mono)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.02%
Damping factor: 100
Input sensitivity: 1V
Signal to noise ratio: 120dB
Speaker load impedance: 4Ω to 16Ω
Dimensions: 450 x 92 x 376mm
Weight: 12kg
• DC Amplification Circuit: Features direct-coupled amplification with low-frequency phase shift reduction.
• Dual Power Supplies: Independent left and right power transformers with triple magnetic shielding and dual rectifier circuits.
• Protection Systems: Triple safety drive protection against terminal short-circuits, DC drift, over-current, and overheating, alongside a relay-switched speaker isolation circuit.
Design & Engineering Highlights
• True Dual-Mono Architecture:
Features independent left and right power transformers with triple magnetic shielding and dual rectifier circuits sharing four 18,000µF filter capacitors.
• All-DC Circuitry: Designed with a current-mirror load differential amplifier first stage, dual-FETs, and a 3-stage Darlington complementary SEPP output stage to eliminate low-frequency phase shift.
• Slim Form Factor: Built at half the height of conventional power amps (2U rack-mountable height), utilizing die-cast side heat sinks.
• Protection Systems: Includes triple-action protection for DC drift, over-current, and over-heat, plus a switchable 2Hz high-pass filter.