First Watt SIT-4 Power Amplifier
Best amplifier for audiophiles pairing high-efficiency speakers with tube-like warmth.
The First Watt SIT-4 Power Amplifier is a unique audio component that blends vintage technology with modern precision. It utilizes rare Static Induction Transistors (SITs) to deliver a sonic character combining tube warmth with solid-state speed. Operating in single-ended Class A mode, it offers a pure signal path. With a modest 12 watts per channel output, it's ideal for high-efficiency speakers. Features include custom output transformers, a soft-start power supply, and an aluminum chassis for durability and heat dissipation. User-adjustable bias allows for personalized sound tuning, making it a choice for audiophiles seeking musicality and clarity.
$5000.00
More SIT Options
Owner Satisfaction
4.5
/ 5
Category Rank
1163
/ 1719
#1163 in Power Amplifiers
Price vs Category Average
-39%
Below average
Amplifier Class
Class A
/ Class A
Who it's for
- Audiophiles seeking tube warmth with solid-state precision
- Purists prioritizing direct signal paths and sonic integrity
- Collectors desiring unique SIT transistor sound signatures
Who should skip it
- Owners of low-sensitivity or power-hungry speaker systems
- Budget-conscious buyers looking for high-value amplification
- Users with limited ventilation or energy-efficient requirements
Performance breakdown
Sonic Texture
SIT technology delivers a rare, organic warmth unmatched by standard transistors.
Signal Purity
Single-ended Class A operation ensures an exceptionally direct and transparent path.
System Synergy
Requires high-efficiency speakers to truly unlock its limited power potential.
Build Integrity
Robust aluminum chassis provides both structural longevity and effective thermal management.
Customization Depth
User-adjustable bias allows for precise fine-tuning of the amplifier's sonic signature.
Operational Simplicity
Minimalist design philosophy removes clutter, focusing entirely on the listening experience.
Key Specs
Amplifier Class
Class A
Power Output
12 watts per channel into 8 ohms
Input Connections
XLR, RCA
Power Supply
Soft-Start
Chassis
Aluminum
Transistor Technology
Static Induction Transistor (SIT)
Features
- Utilizes rare Static Induction Transistor (SIT) technology for a unique sonic character.
- Single-Ended Class A Operation for a pure and direct signal path.
- Low power output (12W per channel) ideal for high-efficiency speakers.
- Custom output transformers designed for optimal performance.
- Soft-start power supply protects components.
- Durable and stylish aluminum chassis aids in heat dissipation.
- User-adjustable bias for personalized sound tuning.
- Minimalist design focused on purity and simplicity.
What customers say
Customers consistently praise the First Watt SIT 4 Power Amplifier for its exceptional sound quality, often describing it as remarkably natural and musical. Many highlight its unique ability to deliver a warm, organic presentation reminiscent of tube amplifiers, yet with solid state precision. The amplifier's minimalist design and robust build quality also receive frequent commendation, reinforcing its premium appeal. Owners appreciate the immersive listening experience it provides, making it a cherished component in high fidelity audio systems. Its performance is a significant draw for discerning audiophiles.
Know before you buy
Because this amplifier produces 12 watts per channel, it is best suited for high-efficiency speakers, typically those with a sensitivity rating of 95dB or higher. It will struggle to drive low-sensitivity or 'power-hungry' speakers to adequate volume levels.
Static Induction Transistors (SITs) behave more like vacuum tubes than traditional transistors, offering a unique sonic signature that blends the warmth and harmonic richness of tubes with the speed and reliability of solid-state design.
The adjustable bias allows you to fine-tune the operating point of the transistors, which subtly alters the amplifier's harmonic profile. This gives you the ability to personalize the sound to better match your specific speakers or listening preferences.
The SIT-4 is versatile and accommodates both connection types, featuring both XLR and RCA inputs. You can choose whichever matches your current preamplifier or source equipment.
Class A amplifiers are inherently less efficient and generate significant heat, which is why the SIT-4 is housed in a robust aluminum chassis designed to act as a large heat sink. Ensure the unit is placed in an open, well-ventilated area to allow for proper thermal management.
The soft-start power supply limits the initial inrush of current when you turn the amplifier on. This protects the internal components from electrical stress, significantly extending the lifespan of the amplifier.
Still have a question?
Ask Hayley anything about this product before you decide.