Amber Series 70 Power Amplifier

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The Series 70 amplifier is a basic power amplifier that works with either 8- or 4-ohm loads in stereo and can be operated in bridge or mono mode. A low-pass filter excludes signals above 100 kHz, eliminating the possibility of distortion due to slew limiting and TIM. A high-pass filter prevents DC transients from being amplified. The amplifier has a modular design so that all circuit components are mounted on interchangeable circuit boards. 

Power output: 70 watts per channel into 8Ω (stereo), 200 watts into 8Ω (mono)
Frequency response: 20Hz to 20kHz
Speaker load impedance: 4Ω (minimum)