The Willsenton R800i 300B 845 Tube Single-Ended Class A Integrated & Power Amplifier is a remarkable piece of audio equipment that has captured the attention of audiophiles worldwide.

This review will delve into the features, performance, and user experiences of this high-end amplifier, helping you decide if it’s the right fit for your audio setup.

I have owned a Willsenton R800i 845 for about 1.5 years and it has completely transformed my audio experience. The sound quality is impeccable, and I can confidently say that I will never go back to transistor amplifiers again.

While there are some potential upgrades one could make, such as improving fuses or tubes, the stock configuration is more than sufficient for most systems under $25k. The amplifier has proven to be a fantastic investment in my audio journey.

Build Quality and Design


The Willsenton R800i 300B 845 Tube Amplifier boasts exceptional build quality, highlighted by its hand-welded point-to-point connections. This meticulous craftsmanship ensures durability and reliability, making it a long-term investment for audiophiles. The amplifier also features high-end EI type single-ended output transformers, which contribute to its robust design and superior sound quality. Additionally, the use of high-efficiency toroidal power transformers with Z11 cores and special materials further enhances its performance and stability.

Power and Performance


This amplifier is equipped with two high-end EI type single-ended output transformers that offer a high-quality broadband response. The power-on high-voltage delay and mute delay function, which lasts about 30 seconds, ensures the safety and longevity of the tubes. The amplifier can handle both 845 and 805 tubes, each offering distinct sound characteristics. The 845 tubes are known for their smooth sound, ideal for vocals and high-efficiency speakers, while the 805 tubes provide high power suitable for dynamic music genres like symphony and jazz.

Sound Quality


Users have praised the Willsenton R800i for its outstanding sound quality, describing it as a life-changing audio experience. The amplifier delivers a warm, rich sound that is often associated with tube amplifiers, making it a favorite among audiophiles. Upgrading the tubes can further enhance the sound quality, offering even more detailed and dynamic audio. The use of a Japanese ALPS high-end potentiometer ensures precise volume control, although some users have noted that the volume control steps are too large and prefer using a separate pre-amp.

Technical Specifications


The Willsenton R800i features independent high-voltage and filament power supplies, which contribute to its efficient performance. The Z11 iron core used in the output transformers and power transformers ensures high-quality broadband response. The amplifier also includes a power-on high-voltage delay and mute delay function of about 30 seconds, which protects the tubes and extends their lifespan. The high-end potentiometer from ALPS ensures accurate volume control, although some users may find the volume steps too large and opt to use a separate pre-amp.

Tubes and Compatibility


One of the key features of the Willsenton R800i is its compatibility with both 845 and 805 tubes. However, it's important to note that these tubes are not interchangeable between different models of the R800i amplifier. The 845 tubes are known for their smooth sound, making them ideal for high-efficiency speakers and vocal-heavy music. In contrast, the 805 tubes offer higher power, suitable for most speakers and dynamic music genres like symphony and jazz. This flexibility allows users to tailor the amplifier's performance to their specific audio preferences.

User Experience

Users have generally had a positive experience with the Willsenton R800i, highlighting its exceptional sound quality and build. Many have noted that the amplifier offers excellent value for its price, with some even referring to it as their 'Holy Grail' of audio equipment. While some users have pointed out that there is a lack of engineering data and guidance on optimal tube configurations, the overall consensus is that the amplifier delivers outstanding performance. The presence of an authorized repair facility in Racine, WI, also adds to the user experience by providing reliable product support.

Price and Value

At a price of $2,969.73 (as of June 6th 2024), the Willsenton R800i offers significant value for its high-end features and performance. Users have consistently praised the amplifier for its outstanding sound quality and build, considering it a worthwhile investment for serious audiophiles. While the initial cost may seem high, the long-term benefits, including durability and the potential for upgrades, make it a cost-effective choice. Additionally, the availability of authorized repair facilities ensures that users can maintain the amplifier's performance over time.

Customer Reviews

The Willsenton R800i has received positive feedback from users, with an average rating of 4.4 out of 5 stars based on nine reviews. Customers have praised its sound quality, build, and value for money. One user mentioned that upgrading the fuses made a significant difference in performance, and others have highlighted the benefits of upgrading the tubes. While there are some concerns about the lack of engineering data and the volume control steps, the overall sentiment is overwhelmingly positive. Users have also appreciated the presence of an authorized repair facility in the U.S., which adds to their confidence in the product.

Potential Upgrades

For those looking to further enhance the performance of the Willsenton R800i, several upgrade options are available. Users have reported noticeable improvements by upgrading the fuses and tubes. For example, switching to PSVane top-of-the-line tubes can provide even better sound quality. Additionally, the internal wiring and capacitors/resistors can be upgraded for those who are more technically inclined. These upgrades, while not necessary for everyone, offer the potential to push the amplifier's performance to an even higher level, making it a flexible and adaptable piece of audio equipment.

Product Support

Customer support is an essential aspect of any high-end audio product, and the Willsenton R800i does not disappoint in this regard. There is an authorized repair facility located in Racine, WI, which provides peace of mind for users in the United States. This facility ensures that any issues can be addressed promptly and professionally. Additionally, users have noted that the manufacturer's website offers helpful information and support, further enhancing the overall ownership experience. It's advisable to contact the manufacturer directly for any specific queries or concerns to ensure accurate and reliable information.


  • High-quality sound
  • Outstanding value for the price
  • Authorized repair facility in the USA


  • Volume control steps are too large
  • Uncertainty about best impedance setup
  • Limited engineering data available


The Willsenton R800i 300B 845 Tube Amp is an outstanding value for its price, offering high-quality sound and impressive performance.

Whether you are a seasoned audiophile or a newcomer to high-end audio, this amplifier is sure to enhance your listening experience and prove to be a worthy addition to your audio setup.

Questions & Answers:

Question: Can the 845 tubes be used on a 805 R-800i amplifier?

Answer: No, the 845 tubes cannot work on a 805 R-800i amplifier. They are completely different amplifiers.

Question: Is there product support available in the USA?

Answer: Yes, there is an authorized repair facility in Racine, WI for those who live in the states.

Question: What is the difference between 845 and 805 tubes?

Answer: Usually, the 845 tubes have a smooth sound and are good for human voice, but have lower power. On the other hand, 805 tubes have higher power and work well with most speakers, especially for large dynamic music like Symphony and Jazz.