Amplifiers
R8 Series
Integrated Vacuum Tube Power Amplifier
The R8 series includes three different versions that use three different types of vacuum tubes for AB1 class push-pull power amplification. Additionally, it features two 6SL7 tubes and two 6SN7 tubes for signal amplification and driving. The pre-stage voltage uses a single 6SN7 tube for a filtered power supply, achieving an output power of 40W/45W per channel.
R8 – EL34
This design uses four EL34 vacuum tubes for AB1 class push-pull power amplification. Additionally, it features two 6SL7 tubes and two 6SN7 tubes for signal amplification and driving. The pre-stage voltage uses a single 6SN7 tube for a filtered power supply, achieving an output power 40W per channel.
R8 – KT88
This design uses four KT88 vacuum tubes for AB1 class push-pull power amplification. Additionally, it features two 6SL7 tubes and two 6SN7 tubes for signal amplification and driving. The pre-stage voltage uses a single 6SN7 tube for a filtered power supply, achieving an output power 45W per channel.
R8 – EH6550
This design uses four EH6550 vacuum tubes for AB1 class push-pull power amplification. Additionally, it features two 6SL7 tubes and two 6SN7 tubes for signal amplification and driving. The pre-stage voltage uses a single 6SN7 tube for a filtered power supply, achieving an output power 45W per channel.
The R8 features handcrafted point-to-point welding construction. The chassis and transformer cover are finished with high-grade piano lacquer for a refined appearance. It includes an external, independent BIAS ADJ current monitoring gauge and a 30-second mute delay function. It also has a headphone output feature, ALPS motorized potentiometer, full remote control functionality, and pure power amp input capability, allowing connection to an independent preamp signal input. Additionally, it features an external TUBE SEL for KT88/EL34 vacuum tube swapping, offering triode and ultra-linear function selection. In triode mode, the sound is soft, pure, and smooth, suitable for enjoying vocals and string music. In ultra-linear mode, the sound is open, exuberant, and powerful, ideal for appreciating large-scale, dynamic music.
The body is made from aviation-grade aluminum alloy with piano paint.
The external independent BIAS ADJ current display meter and current adjustment points.
High-grade ALPS motorized potentiometers made in Japan.
CNC-machined copper terminals plated with gold are aimed at further noise reduction and upgrades.
Details
Features of R8 Series
Aluminum
The body is made from aviation-grade aluminum alloy.
Manual Soldering
We employ artisanal hand-soldering techniques to solder each component manually.
30s Mute Delay
The high-voltage mute delay can effectively protect the vacuum tubes.
ALPS
We use high-grade ALPS potentiometers that are made in Japan.
BIAS ADJ
The high-end external, independent BIAS ADJ current display meter.
Power Amp Mode
We have added a power amp function to this series, allowing you to use your preamp.
Details
Sound of R8 Series
Classical
This series has made every effort to restore classical music instruments, live performance ambiance, and vocal nuances.
Pop / Contemporary
This series has made the greatest effort to achieve the mid-frequencies and high-frequency vocals needed for pop music.
Symphonic / Live
This series makes the utmost effort to reproduce the soundstage and dynamic range of live music faithfully.
Details
Vacuum Tube of R8 Series
We use only high-quality vacuum tubes for our products!
A single 6SN7 is used for a filtered power supply for voltage amplification and driving. The voltage amplification and driving stages use two matched pairs of 6SL7 and 6SN7 tubes. The power amp section employs four KT88 tubes for AB1 class push-pull power amplification. Every component is meticulously hand-wired and soldered, offering effective isolation and shielding, and the body is finished with piano lacquer. This achieves perfection.
Specifications
| Titles | Details |
| Output Power | KT88 25W+25W (When Tube), 45W+45W EL34 25W+25W (When Tube), 40W+40W |
| Harmonic Distortion | 1% (1kHz) |
| Frequency Response | 12Hz ~ 40kHz (+/-0.5dB) |
| Input Sensitivity | 380mV (Integrated Mode) 820mV (Power Amp Mode) |
| Input Impedance | 100KΩ |
| Output Impedance | 4Ω, 8Ω |
| Signal to Noise | 91dB |
| VACUUM TUBE | 6SN7*3, 6SL7*2, KT88*4 / 6550EH*4 / EL34*4 |
| Power | 310W |
| Unit Weight | 57.5lbs (26KG) |
| Gross Weight | 66.2lbs (30KG) |
| Unit Dimensions | 15.75"W * 7.88"H * 15.36"D |
| Voltage Options | Japan - 100V North America - 120V Europe/Asia/Australia/New Zealand - 230V |
| Working Temperature | 32°F to 104°F (0°C to 40°C) |
| Working Humidity | 20% to 80% |
| Temperature | -4°F to 158°F (-20°C to 80°C) |
| Humidity | 20% to 90% |
Gallery
Photos of Our Products
