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Dynaco QSA-300

Stereo / Quad Power Amplifier

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Dynaco QSA-300


The Dynaco QSA-300 is a basic four channel power amplifier employing all silicon semiconductors, including 52 transistors, and 40 diodes.

The output circuitry is of the fully complementary symmetry design. The entire amplifier, except for an input network, is direct coupled.

It’s measured distortion levels approach the threshold of the most exacting laboratory test equipment, not only at the commonly specified full power ratings, but more importantly at very low power outputs as well.

This is the result of circuit techniques which eliminate any discernible crossover notch at low levels, and contributes to the QSA-300's freedom from listening fatigue.

It's accurate, uncoloured sonics have been achieved on a wide variety of loudspeaker loads, including electrostatics and multiple drivers with complex crossovers.


Power output: 75W (4 channel)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.25%

Damping factor: 50

Input sensitivity: 1V

Signal to noise ratio: 95dB

Semiconductors: 52 x transistors, 40 diodes

Dimensions: 18-3/8 x 14-3/8 x 7-3/8 inches

Weight: 52lbs



This website is not affiliated with or sponsored by Dynaco. To purchase QSA-300 spares or accessories, please contact the company via their website or visit an authorised retailer.