Amplifiers
R800i Series
Integrated Vacuum Tube Power Amplifier
The R-800i series uses two 300B tubes to drive various vacuum tubes for single-ended class A amplification. It comprises a dual triode ECC83S and two 6SN7 signal amplification and driving tubes. The pre-stage part employs a 274B tube for rectification, allowing each channel to achieve an output power of 15W/30W/50W.
R800i – 211
The R-800i – 211 uses two 300B tubes to drive 211 vacuum tubes for single-ended class A amplification. It comprises a dual triode ECC83S and two 6SN7 signal amplification and driving tubes. The pre-stage part employs a 274B tube for rectification, allowing each channel to achieve an output power of 15W.
R800i – 845
The R-800i – 845 uses two 300B tubes to drive 845 vacuum tubes for single-ended class A amplification. It comprises a dual triode ECC83S and two 6SN7 signal amplification and driving tubes. The pre-stage part employs a 274B tube for rectification, allowing each channel to achieve an output power of 30W.
R800i – 805
The R-800i – 805 uses two 300B tubes to drive 805 vacuum tubes for single-ended class A amplification. It comprises a dual triode ECC83S and two 6SN7 signal amplification and driving tubes. The pre-stage part employs a 274B tube for rectification, allowing each channel to achieve an output power of 50W.
This series features a dual power transformer design, with the filament using an EI-type transformer and the high voltage employing a toroidal transformer design. The output transformers use two wide-frequency EI types to achieve a sweet sound. It incorporates a dual protection circuit design, an all-aluminum alloy body for the utmost refinement, handcrafted point-to-point soldering, an external, independent BIAS ADJ current monitoring meter, a 30-second mute delay function, ALPS motorized potentiometers, an all-aluminum alloy remote control, and balanced pure post-stage input functionality, allowing for independent pre-stage signal input.
The body is made from aviation-grade aluminum alloy.
The external independent dB level current display meter and current adjustment points.
High-grade ALPS motorized potentiometers made in Japan.
High-end speaker connectors are made in Germany, and CNC-machined copper terminals.
Details
Features of R800i Series
Aluminum
The body is made from aviation-grade aluminum alloy.
Dual Fuses
In this series, we utilize a circuit protection design featuring dual fuses.
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.
Dual Transformer
In this series, We use a design featuring dual transformers and a separate power.
ALPS
We use high-grade ALPS potentiometers that are made in Japan.
BIAS ADJ
The high-end external, independent BIAS ADJ current display meter.
Additional XLR Input
In this series, we’ve added the functionality of an additional XLR input.
Power Amp Mode
We have added a power amp function to this series, allowing you to use your preamp.
Details
Sound of R800i 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 more wider dynamic range of live music faithfully.
Details
Vacuum Tube of R800i Series
We use only high-quality vacuum tubes for our products!
In the preamp part of this R800i series, we use a Czech made ECC83S and two Soviet-made 6SN7 vacuum tubes; for the rectification part, we use our specially customized 274B vacuum tubes with a filament design mimicking the mold screen hook of Western Electric; for the driving and power amp parts, we utilize two of our specially customized 300B vacuum tubes, also mimicking the Western Electric mold screen, and two 805/845/211 vacuum tubes for Class A single-ended power amplification. Every component is meticulously hand-wired and soldered, offering effective isolation and shielding, and the body is finished with full aluminum alloy body. This way, perfection is more fully achieved.
Specifications
| Titles | Details |
| Output Power | 50W + 50W (805) 30W + 30W (845) 15W + 15W (211) |
| Harmonic Distortion | 1% (1kHz) |
| Frequency Response | 12Hz ~ 35kHz (-1.5dB) |
| Input Sensitivity | 805: 280mV, 845: 300mV, 211: 300mV (Integrated Mode) XLR: 280mV 1800mV (Power Amp Mode) |
| Input Impedance | 100KΩ |
| Output Impedance | 0Ω, 4Ω, 8Ω, 16Ω |
| Signal to Noise | 90dB |
| VACUUM TUBE | 12AX7*1, 6SN7*2, 274B*1, 300B*2, 805*2 / 845*2 / 211*2 |
| Power | 380W |
| Unit Weight | 92.60lbs (42KG) |
| Gross Weight | 105.83lbs (48KG) |
| Unit Dimensions | 17.33"W * 10.83"H * 16.14"D (440mm W * 275mm H * 410mm 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% |
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