hifi engine

Manual Library / Dynaco

Dynaco Stereo 120

Stereo Power Amplifier (1971-72)

add a review (3 reviews)

Dynaco Stereo 120


The Dynaco Stereo 120 is an all silicon transistor basic power amplifier for use with separate preamplifiers such as the Dynaco PAT-4 or PAT-5, or for use with tape recorders or tuners such as the FM-5 or AF-6, which have their own volume controls.

The unit contains two 60 watt amplifiers on one chassis with a common power supply.

Although the Stereo 120 is a solid state device, containing transistors and similar semiconductors, it has been designed to be used under normal conditions without special safety precautions, just as if it were a high grade tube amplifier.

Thus it can be connected to source and speaker components and used with confidence in all conventional arrangements.

There are no circuit breakers, speaker fuses, or other resettable devices to impede the use of the Stereo 120 under any reasonable conditions of use or abuse.

This is achieved by using novel circuits (on which patents are pending) which automatically and instantly protect the amplifier.


Power output: 60 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 100kHz

Total harmonic distortion: 0.5%

Damping factor: 40

Input sensitivity: 1.5V

Signal to noise ratio: 95dB

Speaker load impedance: 4Ω to 16Ω

Semiconductors: 15 x transistors, 15 x diodes

Dimensions: 13 x 10.5 x 4 inches

Weight: 20lbs


Related Catalogues

High Fidelity Components


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.


 Login or register to post reviews

Reviewed Mar 24th, 2019 by vglory88

Classic amp, capacitor coupled, same as Sony TA-1120 and Marantz 1060, for extra sweetness and smoothness. Has beautiful tube-like sound.

Reviewed May 10th, 2016 by Peter Wieck

By the time I am done with one of these beasts, it would be a healthy 9. As found typically, seldom above a 4. One I found today would be a 4 cosmetically, and a 0 electronically as there was a 1/4 x 1/8 inch hole burnt through the power-supply board - not atypical.

Reviewed Feb 10th, 2014 by Evman

Nice sounding amp. Get them cheap on EBay. VanAlstine web site has upgrades to power supply and other things. Very cheap to do. I promise you won't be disappointed.



re: Stereo 120

It's worth noting that the Stereo 120 amp is a single-ended design with a 72V power supply rail. That puts the output floating at 36V so a large electrolytic capacitor is needed to block this DC voltage from harming your speakers. Yes dear audiophiles--all the sound passes through an evil electrolytic capacitor!

re: Stereo 120

A great vintage workhorse amplifier for the money!

This website is not affiliated with or sponsored by Dynaco. To purchase Stereo 120 spares or accessories, please contact the company via their website or visit an authorised retailer.