hifi engine

Manual Library / Dynaco

Dynaco QSA-300

Stereo / Quad Power Amplifier

add a review add a review

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


instruction/owners manual   English -

If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.

If you have additional documentation please consider donating a copy to our free archive.


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.