Dynaco ST70 Review

Picture this: you’re in a college dorm room, surrounded by friends, and eager to blast your favorite tunes. What’s the sound system of choice? Chances are, it’s the Dynaco ST70 – the legendary amplifier that changed the game for music lovers everywhere.

With its simple yet powerful design, the ST70 quickly became a household name, offering audiophiles high-quality sound at an affordable price. But what made the ST70 so special, and does it still hold up today? In this article, we’ll dive deep into the world of Dynaco and review the iconic ST70 – exploring its features, alternatives, pros and cons, and more.

Whether you’re a die-hard audiophile or simply looking for your next sound system upgrade, you won’t want to miss this.

tube amps laying on a table to illustrate dynaco st70 review

Product Overview

The Dynaco ST-70 is a true powerhouse of an amplifier, boasting an impressive array of components that work together to deliver top-notch sound quality. EL34 output tubes, a rectifier tube, input tubes, and a driver circuit on a pre-assembled PCB all come together to create a stunning sonic experience.

In addition, each channel’s driver circuit is equipped with a single 7199 pentode/triode tube, ensuring maximum performance and clarity. But what really sets the ST-70 apart is its ultralinear output transformers, which utilize a unique design to minimize distortion and deliver pure, unadulterated sound.

With a power output of 35 watts per channel, the ST-70 is more than capable of filling any room with rich, vibrant sound. And thanks to Dynaco’s careful attention to circuit design, you can rest assured that every component of this amplifier has been expertly crafted to provide both exceptional sound quality and long-lasting durabilit

f the primary coil sent back to the screen grid of the output tube. This design enhanced audio quality by reducing distortion.  It has a power output of 35 watts per channel. 

The ST-70 was a masterwork of circuit design, providing dependable, good-quality audio amplification at a low cost. Dynaco clearly spent the effort necessary to ensure the sound quality and dependability of all components of this upgraded design.


The Dynaco ST-70 is a stunning piece of audio equipment that is sure to impress even the most discerning audiophile. Unlike previous models, the ST-70 is sold pre-assembled, with a sleek all-black exterior that is both modern and eye-catching. Even the rubber feet are brand new, adding to the overall appeal of this stunning amplifier.

But it’s not just the looks that make the ST-70 stand out – it’s also the sound quality. With a clear, warm, and well-defined sound, this amplifier is perfect for both recording studios and living rooms. And thanks to its sturdy construction and weight of 42 lbs, you can be sure that it will stand up to even the most demanding listening situations.

One of the standout features of the ST-70 is its tube setup, which is already pre-configured for maximum performance. Simply plug everything in, flip the switch, and let the amplifier warm up for 30 seconds. After that, you’ll be treated to an hour of rich, delicious sound that will only get better with time.

The ST-70 also includes a high pass button that can be used to eliminate rumbling bass from heavy music, as well as tube bias lights and adjustment slots that allow you to fine-tune the performance of the four output tubes. And with a sleek and modern grill shell design, this amplifier is sure to look great wherever you choose to place it.

Overall, the Dynaco ST-70 is a top-of-the-line amplifier that offers exceptional sound quality and unparalleled performance. Whether you’re a professional musician or simply a music lover, you won’t be disappointed with this outstanding piece of audio equipment.

Alternatives To The Dynaco ST70

Dynaco ST35

The Dynaco ST-35, unlike its bigger sibling, the Dynaco ST-70, produced 17 1/2 watts per channel (half of the ST-70). The ST-35 is the most sought-after of Dynaco’s tube audio products, and it’s becoming increasingly difficult to locate these days. It occasionally appears on online auctions.

The Dynaco ST-35 is a unique amplifier due to its compact size and amazing sound it generated despite its diminutive size. It is quite heavy for a little amplifier, weighing in at 16 pounds. A Dynaco ST-70 weighs exactly half as much as this.

It’s great at playing music, especially when it’s been modified.

Where Can I Get The Dynaco ST70?

The Dynaco is a great option for any sound system, especially for those on a tight budget. Unfortunately, demand for this amplifier has skyrocketed, but supply remains plentiful. They normally sell for roughly $350 on eBay, but I recommend shopping for an original, untouched model.


Dynaco is a well-known brand, well known for its Stereo ST-70 tube amplifier, which was invented and built by David Hafler in 1959. Throughout its 350,000+ unit lifespan and ownership by three separate firms, it’s aim has indeed been musical involvement with premium sound quality at a reasonable price. And that nearly 60-year legacy has been meticulously updated to deliver both a 21st-century technology edition of this tried-and-true-sounding design, as well as an essential reference to all the components that have made this amp so popular over the years! 

And the outcomes are undeniable. If you’re seeking musical amplification with a cutting-edge tube circuit that has surpassed the expectations of countless listeners for nearly 60 years, you’ve come to the right place! Please test the new Dynaco ST-70 in your system or a trustworthy friend’s system and let me know if it doesn’t enhance your musical world.