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Dynaco Stereo 410

Stereo Power Amplifier

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Dynaco Stereo 410


The Dynaco Stereo 410 is a basic two channel power amplifier employing all silicon semiconductors. They include 38 transistors, 2 zener diodes, 24 diodes, and 3 thermal sensors.

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

It's measured distortion levels approach the threshold of much 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 Stereo 410'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.

The design of a superb power amplifier implies the necessity of several protection techniques for the amplifier, and for the speaker load. In addition to the AC line fuse, four separate B+ fuses are supplied. Electronic volt-amp limiting ensure safe operation of the output transistors, and an independent thermal cut-out for each output stage protects from high temperature.

A large radiating area for the heat fins, which are attached to an aluminium back panel, and cooled with a thermostatically operated two speed fan, form a highly efficient heat sink. Speaker fuses protect the load.

The Stereo 410 has been designed as two independent 200 watts (into 8 ohms) amplifying channels with a common power supply having a high degree of inherent regulation.

In addition, where higher power is required, an extra cost circuit board assembly will be made available to permit monophonic (bridge) operation for 8 and 16 ohm loads. An accessory kit is also planned at additional cost for two output meters and meter switching, which includes an alternative front panel.


Power output: 200 watts per channel into 8Ω (stereo)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.25%

Damping factor: 30

Input sensitivity: 1.6V

Signal to noise ratio: 95dB

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 38 x transistors, 2 x zener diodes, 24 x diodes, 3 x thermal sensors

Dimensions: 17 x 14.5 x 7.25 inches

Weight: 44lbs



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Reviewed Dec 21st, 2017 by mrhumph

I had a gold 400 in the late 70's. Had to sell it.
20 years ago I bought a 410 kit from Sound Values with extra output transistors and extra power supply capacitors.

I built it using the 416 output circuit with a double independent power supply using separate bridge rectifiers.

So I have a black box 416 with no protection circuits. Nothing between the input and output but Amp. Life on the edge.

Then I got nuts and added 1 farad of capacitors in an outboard box. It made a real difference in the sound. It is really good. Clean clear powerful.

Good solid machine.

Reviewed Jul 21st, 2014 by Tom98915

I have owned one since 1983. An amazing amplifier value for its time and still now it holds its own quite well.

The 200 w/ch rating is VERY conservative. I have never got mine to distort or clip under normal listening conditions regardless of digital or good analog source material. That is testament to a good design of amplifier.



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