R800i 845 Features:
Hand welding point to point, the main circuit adopts shed welding
Two high-end EI type single-ended output transformers with high-end special technology and high-quality broadband response made of Z11 iron core.
High-voltage power supply and filament power supply independently use high-efficiency toroidal, high-power power transformers with Z11 cores and special materials.
The front stage uses one 12AX7 and two 6SN7 vacuum tubes; the driving part uses two 300B tubes to amplify the rear stage.
The front stage uses a 5U4G 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 stage function
Power-on high-voltage delay and mute delay function (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

Product parameters:
Rated output power: 23W + 23W (RMS)
Machine frequency response: 12Hz ~ 35kHz (-1.5dB)
Input sensitivity:845 = 300mV
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: Power consumption: 380W
Vacuum tube: 12AX7 (ECC83s Brand JJ)x 1, 6SN7 x2, 274B x1, 300B x2, 805 x2
Machine volume: (440 * 410 * 275) mm
Net weight: 42kg
Gross weight: 48kg
Power supply voltage: AC 100V to 240V 60Hz/50Hz
(there is a 230V/115V voltage change-over switch inside of body)