RAPHAELITE CSM21 211 12W Single Ended Mono Block Tube Valve Amplifier W/ Step-up Interstage Transformer


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RAPHAELITE CSM21 211 12W  single ended mono block tube valve amplifiers,The circuit is coposed with 12AT7 2A3 and 211 tubes,The CSM21 211 VT-4-C mono block amplifier rate 12 Watts on 8 Ohms speaker,The price is for pair mono block.

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RAPHAELITE CS21 211 12W Single Ended Mono Block Tube Valve Amplifier W/ Step-up Interstage Transformer


  • Permalloy input transformer at first stage to variable gain selection,Low distortion and no negative feedback needed.
  • XLR balanced input and RCA unbalanced input are accepted.
  • Use 2A3 triode tube from Sovtek(Russia) as driver stage, Jensen copper film oil capacitor employed between 12AT7 and 2A3.
  • One high performance 1:1.5 step-up transformer between 2A3 and 211 tube to raise voltage for 211 triode tube.
  • UV meter to monitor plate current,Plate current can be matched precisely.
  • The filament of 211 tube and 2A3 tube is powered with DC current for lower noise.



  •  Tubes: 5Z4P(5V4G)*2 , 12AT7/ECC81*2 , 2A3/VT-95 *2 , 211/VT-4-C *2
  • Input: RCA or balanced
  • Input sensitivity: 700mV
  • Power output : 12W (RMS THD<5%)
  • S/N Ratio: 80dB
  • Input Impedance: 600Ω 
  • Output Impedance: 4Ω/8Ω or 16Ω/8Ω (send 4/8 Ohm by default if not specificed)
  • AC Input: 110 V/220V/230V (We will send according to the voltage in your country,110V version will take another week to customize)
  • Power Consumption: 200W(one channel)
  • Insulation Intensity: 230MΩ (DC2000V, 1min) 
  • Frequency Response:  19Hz – 25KHz -2dB
  • Dimension: 219*445*195 (W-D-H)
  • Weight: 25KG  (one channel)

Packing List

  • One pair RAPHAELITE Sinovt CS21M 211 mono block single ended tube amplifier.

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