hARt Lab
Amplifiers
Preamplifiers
Website
Best Known For
Amplifiers
/
Class: Tube
Used Products
0
 Available
Average Price
$40,001-$75,000
Brand Popularity
515
 of 900+
Products Listed
5
Review Count
3
Founding Year
Headquarters
Greece
hARt Lab
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What's unique about the brand

Hart Lab handcrafts amplifiers that combine avant-garde design with tubes and MOSFETs, featuring a unique circuit developed over 25 years that uses no feedback loops. Their signature Tune Five monoblock amplifiers feature a sophisticated architecture of wood, metal, and plastic, supported by custom FloatO suspension legs, and are designed to enhance the essence of beloved loudspeakers.

What reviewers are saying

We read all the reviews. Here's what reviewers feel most strongly about:

Our favorite reviewer quotes:

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Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

From Julian's interview with
.

Lineup comparison

We think it's helpful to understand how their products compare. To learn more about each, scroll to the section above to click through to individual product pages.

Tune Two – Reference Preamplifier

  • Positioning: An entry-level preamplifier focused on delivering clear and faithful signal control.
  • Description: Features a straightforward design with high-quality attenuation and minimal circuitry complexity that preserves signal purity. Compared to the other products, its simpler build and lower component count make it ideal for smaller rooms and users with a moderate budget who need basic functionality.

Tune Three – Reference Dual Mono Amplifier

  • Positioning: A dual mono power amplifier engineered for accurate and transparent sound reproduction.
  • Description: Uses a unique hybrid design that combines a tube voltage stage with a MOSFET transimpedance output, ensuring highly linear amplification without feedback.

Tune Four – Superior Preamplifier

  • Positioning: A high-end preamplifier that builds on the basic reference design with refined circuitry.
  • Description: Offers enhanced signal processing with upgraded components and improved digital integration for increased control and audio detail. Relative to Tune Two and Tune Three, its more meticulous circuitry and build quality provides greater sonic accuracy and additional connectivity options.

Tune Five – Superior Mono Block Amplifier

  • Positioning: A premium monoblock amplifier designed for robust power delivery and refined soundstage.
  • Description: Uses a superior hybrid design with twin vacuum tubes in a TiPD circuit combined with a high-current MOSFET output stage, ensuring clean and stable amplification.

Tune Six – Super Integrated Amplifier

  • Positioning: A flagship integrated amplifier that combines preamplification, power amplification, streaming, and additional digital functions.
  • Description: Blends a groundbreaking tube/MOSFET hybrid design with modern features like a touchscreen interface, built-in DAC, and versatile connectivity, offering a comprehensive audio solution in one unit. Compared to the separate reference and superior products, its all-in-one design and expanded functionality delivers an unparalleled experience for users seeking convenience and top-tier performance regardless of room size or functional needs.
Website author headshot
Julian Shapiro
ExtremeHiFi Writer

Used

hARt Lab

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Website author headshot
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Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
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True Life Audio (TLA) employs a unique hybrid design in their amplifiers, combining tube and solid-state technologies with custom-designed, hand-wound transformers made in-house. Their Supreme Series features a dual-mono design with separate power supplies for each channel, and they use ultra-wide bandwidth interstage transformers while rejecting signal-path capacitors to achieve a more natural sound.

Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
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About the brand

Ypsilon's amplifiers feature a unique hybrid approach that combines tube and solid-state technologies in a minimalist circuit design with only two gain stages, delivering the sonic purity of single-ended designs with the power of push-pull configurations.

Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
Brand Page
Known For
Amplifiers
/
Class: Tube
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Used Products
0
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Brand Popularity
419
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About the brand

Engström is a Swedish hifi brand that handcrafts amplifiers with a minimalist Nordic design, featuring fully balanced, transformer-coupled circuits and no negative feedback to preserve natural sound dynamics. Their amplifiers, which use KR Audio's T-100 power tubes, are known for creating an expansive, three-dimensional soundstage with what audiophiles call a "Scandinavian Sound"—characterized by open, detailed, and natural sonic qualities.

Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

What's your approach to customer support?

What are your favorite tracks for showcasing the strength of your products?

What other products pair best with yours?

Website author headshot
Julian Shapiro
ExtremeHiFi
Brand Page
Known For
Amplifiers
/
Class: Tube
Average Price
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Used Products
0
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Brand Popularity
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Headquarters
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About the brand

VinylSavor stands out for its unique use of transformer coupling and transformer volume control in preamps, along with vacuum tube rectified high voltage supplies and low impedance circuits. The brand's equipment, personally built and tested by Thomas Mayer, is engineered with custom-made transformers and multiple chokes for excellent power supply performance, eliminating the need for expensive power conditioners or exotic cables.

Our interview with the brand

What are two key technological innovations or strong opinions that differ you from other brands?

Fully transformer coupled designs. The use of directly heated triodes not only as output tube but also as drive rand preamp tube. 600 Ohm LCR RIAA EQ in phono stages. Custom triodes for the Intrepid series (Thomas Mayer ONE, TWO and THREE). Possibility to customise each product to specific needs.

What's your approach to customer support?

I sell directly to end customers. I used to have very few resellers but due to the steep increase of production and material costs I exclusive do direct sales now to avoid price increases of the products which would otherwise be necessary. My goal is that every customer is happy and I am always available for any questions even years after the sale. When necessary I do repairs or assist in set up at the customer site. 

What are your favorite tracks for showcasing the strength of your products?

I don’t have any favourite tracks, but use whatever I am in the mood for. Equipment should not be designed to work with specific music. People should use music they like for testing

What other products pair best with yours?

Admire Audio speakers.

Website author headshot
Julian Shapiro
ExtremeHiFi
Brand Page

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