First Watt SIT-5 Monoblock Amplifier
Best choice for audiophiles seeking tube-like warmth with solid-state precision.
The First Watt SIT-5 Monoblock Amplifier is a unique audio component that leverages rare Static Induction Transistors (SITs) for a distinct sonic character. It combines the warmth of vacuum tubes with the speed and precision of solid-state electronics. This amplifier operates in Single-Ended Class A, delivering a low power output with custom output transformers. It features unbalanced RCA inputs and a soft-start power supply housed within a durable aluminum chassis. The bias is user-adjustable, offering flexibility for audiophiles seeking a refined listening experience.
$11000.00
More SIT Options
Owner Satisfaction
4.6
/ 5
Category Rank
934
/ 1719
#934 in Power Amplifiers
Price vs Category Average
+33%
Above average
Distortion @ 1 Watt
0.07
/ %
Who it's for
- Purists seeking tube-like transparency with solid-state reliability
- Listeners craving an immersive and emotionally resonant musical experience
- Collectors valuing artisan craftsmanship and unique high-end aesthetics
Who should skip it
- Owners of low-sensitivity speakers requiring high power output
- Budget-conscious audiophiles seeking high-value component investments
- Users preferring plug-and-play compatibility over precise speaker matching
Performance breakdown
Sonic Character
SIT technology delivers a rare, tube-like harmonic richness and organic texture.
Transient Speed
Retains solid-state agility for precise, lightning-fast musical transients.
Power Efficiency
Class A operation demands significant power for relatively modest output levels.
Build Quality
Robust aluminum chassis reflects a high-end, artisanal approach to construction.
User Adjustability
Manual bias control allows for precise tuning to your specific speakers.
Signal Purity
Exceptional noise floor ensures a clean, black background for delicate details.
Key Specs
Distortion @ 1 Watt
0.07%
Input Impedance
100 Kohm
Gain
19 dB
Damping Factor
25
Output Power
35 watts @ 1% THD, 8 ohms
Frequency Response
5 Hz to 200 KHz (-3 dB)
Noise
30 µV unweighted, 20-20 KHz
Power Consumption
200 watts
Features
- Utilizes Static Induction Transistors for a unique sonic character
- Combines the warmth of tubes with the speed and precision of solid-state
- Single-Ended Class A Operation
- Low Power Output
- Custom Output Transformers
- Unbalanced RCA Inputs
- Soft-Start Power Supply
- User-Adjustable Bias
What customers say
Customers consistently praise the First Watt SIT 5 Monoblock Amplifier for its exceptional sound quality, often described as natural, transparent, and deeply engaging. Listeners highlight its ability to reproduce music with remarkable clarity and an organic warmth that brings recordings to life. The amplifier's minimalist yet robust design also receives appreciation, reflecting a commitment to pure audio performance and solid craftsmanship. Owners frequently note its unique sonic character and how it elevates their listening experience, making it a cherished component in their audio systems.
Know before you buy
SITs are rare components that behave more like vacuum tubes than standard transistors. They provide a specific harmonic profile that blends the natural warmth of tubes with the speed, detail, and reliability of solid-state design.
At 35 watts per channel, this amplifier is best suited for high-efficiency speakers. If you have speakers with a sensitivity rating of 90dB or higher, it will provide plenty of headroom and dynamic control for most listening environments.
User-adjustable bias allows you to fine-tune the amplifier's operating point to suit your specific speakers or personal sonic preferences. It provides a level of customization that lets you balance heat output against the amplifier's harmonic character.
The SIT-5 is designed with unbalanced RCA inputs, making it compatible with most standard preamplifiers and source components. Because it is a monoblock design, you will need one amplifier for each channel and a pair of high-quality interconnects.
Single-Ended Class A operation is prized for its lack of switching distortion, resulting in a very smooth and musical presentation. However, it is less energy-efficient than other designs, which is why the unit consumes 200 watts and requires a robust, well-ventilated chassis.
Beyond ensuring the unit has adequate space for ventilation due to its Class A operation, maintenance is minimal. You should periodically check the bias settings as the components settle, and ensure the fuse is replaced with the correct 3AG slow-blow type if needed.
Still have a question?
Ask Hayley anything about this product before you decide.