Yamamoto Sound Craft HA-03 Tube Headphone/Speaker Amplifier
Product code: ha03-1Yamamoto Sound Craft HA-03 Tube Headphone/Speaker Amplifier
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I want to use both headphones and speakers.
Amazing tube sound from headphones and speakers
C3m single-stage non-return circuit. Maximize the charm of vacuum tubes to drive both headphones and speakers with the best sound quality
The HA-03 is a unique amplifier designed to ensure that both headphones and speakers can enjoy the best possible sound quality. The circuit configuration has been simplified to the extreme, bringing out the charm of the vacuum tube to the fullest.
Because it is simple, the sound is fresh and you can enjoy the music.
- Vacuum Tube C3m Single Stage Amplification: It is an extremely simple configuration that uses only one step of the pentode C3m of a vintage vacuum tube made by Siemens in Germany with a pentode connection.
- No negative feedback (no feedback method): It adopts the simplest and most natural no-return method. It does not use negative feedback (NFB) and minimizes sound degradation by reducing the number of components passing through the circuit to the limit. Because of its simplicity, the sound is fresh and the fun of the music stands out.
- High Output: By using the screen grid circuit and plate circuit as separate power supplies and setting the screen grid circuit to a constant voltage, we can obtain a practical output of about 1W at the speaker load.
The power of 1W output and wide range of support
- Maximum Output: It achieves an output of 1.4W with headphone load and 1.0W with speaker load.
- The power of the tube amplifier: The output of 1W may seem small, but it is said that the output of a tube amplifier is as powerful as that of a semiconductor amplifier.
- If the speakers are somewhat efficient (especially small bookshelf speakers), you can enjoy dense, high-quality sound with satisfactory sound up to medium volume.
- Headphone Compatibility: It can accommodate headphones with a wide range of impedances, from 16Ω to around 200Ω.
High-FidelityCarefully selected use of materials
- Chassis: Adopts high-insulation and high-strength phenolic resin reinforced wood,High-FidelityIt contributes to the transformation.
- Power Transformer: Adopts a large R-core transformer.
- Resistors: Products from all over the world, such as using wire-wound resistors manufactured by DALE in the United States.High-FidelityWe carefully select parts.
Spec
| Vacuum tube used | Two C3m (vintage vacuum tubes manufactured by Siemens, Germany) included |
|---|---|
| maximum output | 1.4W+1.4W (50Ω/headphone load) 1W+1W (8Ω/speaker load) |
| Frequency characteristics | 35Hz~17.5kHz(-3dB) |
| residual noise | 57μV (with A filter) |
| input impedance | 50kΩ Input switching: 2 systems selectable |
| size | 156(W)330(D)165(H)mm |
| weight | 5.6kg |
Smooth texture and clear contours
Although the HA-03 is a vacuum tube amp, the sound is not overly colored and has an impressive smooth texture. On the other hand, the unevenness of the sound is clear and the contours are not blurred. Although it is not the type that exaggerates the range to make it appear wider, the sound image is bright and vivid, and the information is well-organized and reproducible.
Distinctive shadow expression when playing through headphones
When played through headphones, the shadows of the sound are richly differentiated. The impression is that the nuances of the details are not buried, and the three-dimensional feel of the sound naturally emerges. Even when using the SENNHEISER HD-650, there is no sense of lack of drive, and the sound does not become cramped, and the sound is sufficient. It is also attractive that it is highly compatible and easy to use without having to choose a specific pair of headphones.
The sense of density you can feel with piano and jazz
During piano playback, the touch is clear and you can feel the depth of the core. The attack is not ambiguous, and the movement of the keyboard is conveyed as if it were in your hands. On the other hand, in jazz, the unexpected bass expression is impressive, and although it does not boast volume, it has a solid response and provides a stable rhythmic foundation.
Characters that are common in speaker playback
Even when playing through speakers, the basic tone remains the same, allowing you to enjoy a dense texture. It's not the type to play at high volume, but if you use bookshelf speakers in a small space, you'll be able to enjoy natural playback. It is preferable that the sound does not become harsh and that a calm musical expression is maintained.
Balance between vacuum tube quality and practicality
The HA-03 is not a model that emphasizes the softness and ambiance of a tube amplifier. Rather, it prioritizes clarity and density, aiming for consistent performance with both headphones and speakers. It may not be flashy, but it is a unit with a texture and versatility that can be enjoyed for a long time.
