R800i 845 Features:
Manual point-to-point welding, the main circuit adopts shed welding
Two high-end EI type single end 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 high-power toroidal transformers with Z11 cores and special materials.
The front stage uses one 12AX7 and two vacuum tubes 6SN7; the drive part uses two tubes 300B 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 signal input groups A, B, C, (D) BALANCE, E (PREIN). This machine is specially equipped with balanced input function and pure rear stage function
High voltage delay and mute delay function (about 30 seconds).
Remote control with infrared function.
Uses high-end ALPS Japanese potentiometer.
Easy to install plug-in vacuum tube protector.
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 x 410 x 275 mm.
Net weight: 42 kg.
Gross weight: 48 kg.
Power supply voltage: AC 100V to 240V 60Hz/50Hz
(There is a 230V/115V voltage change switch inside the body.)