China Audiophile R-800i 300B 845 HIFI Class A Power Amplifier Single ended tube Amplifier

Features:

The Export version use the piano lacquer transformer cover that show it very high range.
The Export version use the Special Tailor-Made tube socket for the 845, so, make the tubes very good connect and stronge, tubes get long life and have nice sound.
Hand welding point to point, the main circuit adopts shed welding
Two wide frequency high-end EI type single-ended output transformers with high-end special technology and high-quality broadband response made of Z11 iron core to get the sweet sound.
High-voltage power supply and filament power supply independently use large high-efficiency toroidal, high-power power transformers with Z11 cores and special materials with sweet voice.
High voltage and low voltage dual power transformer, double insurance design, lightning protection and short circuit protection and electronic tube insurance are adopted to prevent the electronic tube from burning the transformer. Level meter and bias meter switching use. Blu ray dual meter design, true full balance input and pure rear stage independent input.
The whole machine is designed with aluminum alloy casing. It adopts imported materials and is tested and inspected in strict accordance with European standards.
The front stage uses one 12AX7(ECC83s)(Brand JJ) and two 6SN7 vacuum tubes; the driving part uses two 300B electronic tubes to amplify the rear stage.
The front stage uses a 274B(fishhook style) for rectification
The rear stage uses two 845 vacuum tubes for class A single-ended power amplification
Five groups of signal input A, B, C, (D) BALANCE, E (PREIN) This machine is specially equipped with balanced input function and pure rear function
Power on mute delay function, soft-start feature to prolong tube life (about 30 seconds).
Infrared function remote control
Use Japanese ALPS high-end potentiometer
Easy-to-install plug-in vacuum tube shield
Peripheral power tube bias current adjustment function and power output level meter sensitivity switch
Negative feedback circuit design
Soft, pure and sleek sound, suitable for listening to various types of music

Product parameters:
Rated output power: 23W + 23W (RMS)
Machine frequency response: 12Hz ~ 35kHz (-1.5dB)
Input sensitivity: 280mV
Balance input: 280mV
Pure power stage: 1800mV
Input impedance: 100KΩ
Output impedance: 4Ω, 8Ω, 16Ω
Harmonic distortion: 1% (1kHz)
Signal to noise ratio: 90dB
Left and right output balance: <± 0.5dB
Power consumption: 380W
Vacuum tube: 12AX7(JJ ECC83s) × 1, 6SN7 × 2, 274B x1, 300B × 2, 845 × 2
Working conditions: temperature: 0 ° c ~ 40 ° c humidity: 20% -80%
Storage conditions: temperature: 20 ° c ~ 70 ° c humidity: 20% -90%
Machine volume: (440 * 410 * 275) mm
Net weight: 42kg
Gross weight: 48kg