Willsenton R800i 300B 845 Tube Single-Ended Class A Integrated & Power Amplifier Balanced XLR Input

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 A-L-P-S 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:
FTC rated output power: 15W+15W (8 ohms, 20HZ-20KHZ, THD 1%)
Rated output power: 20W+20W
Whole machine frequency response: 12Hz-25KHz(-1.5dB)
Harmonic distortion: 0.5% (1W/1kHz, rated output power less than 10%)
Signal to noise ratio: 88Db (weighted by A)
Input sensitivity: 180Mv (Integrated ), 390Mv (power stage)
Input impedance: 100k Ω
Output impedance: 4 ohms, 8 ohms, 16 ohms
Whole machine volume: 440x410x275mm (WxDxH)
Vacuum tubes: 12AX7x1, 6SN7x2, 300Bx2,845x2,274Bx1
Net weight: 42 KG
Gross weight: 51kg
Power supply voltage: AC 110V to 240V 60Hz/50Hz
(there is a 230V/115V voltage change-over switch inside of body

• 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..
• Power-on high-voltage delay and mute delay function (about 30 seconds),Use Japanese ALPS high-end potentiometer.
• The 845 tubes can NOT work on a 805 R-800i amplifier, the 805 tubes can NOT work on a 845 R-800i amplifier. They are completely different amplifiers..
• What is difference between 845 and 805 tubes? Usually, the 845 tubes have a smooth sound, it is good at human voice, very nice sound, but the power is not too high, so, 845 fits the speakers are high efficiency. 805 tubes have a high power, so, it work well with most of speakers(but please don't use 805 at a pair of very high efficiency speakers), and 805 is good at large dynamic musics like Symphony, jazz..