R100 have 3 version :  845/211/805 ,  the exterior of amplifier are same between  these 3 different version , 

but each version is definitive,  it can NOT exchange the power tube between these 3 differents version 

1.The whole panel is made of 14mm aerospace solid aluminum wire drawing. The knob is made of full solid aluminum high-gloss car. The signal switch on both sides adopts Japanese knurling technology, and the hand damping is very good. High-precision multi-function output power meter and ammeter, backlight black The bottom is specially made of film. The back of the dial is set with dozens of LED lamp beads, the double structure chassis base, the outer layer is laid with 3mm brushed aluminum plate, and the inner layer is made of 2mm thick steel plate.

2.The R100 power switch key is placed on the left side of the panel; the side knurling knob has built-in 4-speed dedicated functions, namely BIAS V1, BIAS V2 and METER H, METER L, to adjust the power tube V1, V2 bias current selection and level meter sensitivity. Damping selection. The right side of the meter head is the volume adjustment knob, which uses a high-precision ALPS potentiometer specially designed in Japan. The right-hand knurled knob is a 6-speed source input selection file, which are PHONO (single release), lin1, lin2, lin3, BALACNCE (balanced). ), PRE IN (pure power amp)

3.R100's high-voltage power supply and filament power supply independently use two Z11 iron core high-efficiency power supply cattle, the output transformer uses two Z11 iron core wide-band EI single-ended output cattle, all powered separately.

4.The R100 filter circuit uses 12 1500uf 600V Japanese Nichicon large hydrothermal capacitors and two specially designed chokes.

5.The R100 not only has the full analog amplification function of the vacuum tube power amplifier, but also puts the enthusiast's favorite vinyl singing function into it. The MM cartridge input R100 also has pure post-level function. The R100 has three sets of analog audio inputs, one group sings. Head input, a set of pre-stage inputs, and also a set of balanced input BALANCE ports, this is a true balanced input, R100 output has 4 ohms, 8 ohms and 16 ohms respectively, support all impedance speakers.

6. MUZISHARE is one of best chinese hi-fi equiment production manufacturer,  Their products have past Certificate of Conformity European(CE)

300B Drive 845 Amplifier:
The tone is noble and gorgeous, the lines are clear, full and transparent, the penetrating power, the sound line layer density is fine and smooth, the tension is full, the sound field is rich and infectious, the medium frequency is rich and thick, and the low frequency is full.)

Technical Parameters:

•  Rated output power: 30W + 30W                                 
•  Input : PHONO, lin1,lin2,lin3,Balance ,Pre IN 
  Output Impedance: 4Ω 8Ω 16Ω
• SNR: 92 dB
• Harmonic distortion: 1% (1kHz) Frequency Machine: 15Hz ~ 35kHz (-1.5dB)
• Net weight: 42kg 
• Package weight:  48kg
• power consumption: 
• Vacuum tube are Special Customized:
•                    Preamp tube:  12AX7 × 2
                     Preamp tube: 6SN7 × 2   
                     Power tube: 300B × 2, 845x2 
                     Rectifier: 5U4G × 1 
• Dimension:(W × D × H): 430*435*265mm

300B Drive 211:
warm tone, soothing elegance, delicate and transparent, quiet background, high frequency smooth, medium frequency pure and moist

Technical Parameters: