Stereo Power Amplifier
The Heathkit AA-121 high fidelity stereo amplifier incorporates two complete amplifier channels and a common power supply which provides B+ voltage, negative bias voltage and filament voltage to both channels.
Each channel has separate input level and bias adjustment controls.
The function selector switch facilitates the selection of either stereo or monophonic operation.
Power output: 40 watts per channel into 8Ω (stereo), 80W into 8Ω (mono)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 1.5%
Damping factor: 16
Input sensitivity: 0.95V
Signal to noise ratio: 85dB
Speaker load impedance: 4Ω to 32Ω
Semiconductors: 4 x silicon diodes, 1 x selenium diode rectifier
Valve complement: 2 x 6AN8, 4 x EL34
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