2 Pcs/set LJM Accuphase E210 Modified Version L6 Power Amplifier Board

• Basic parameter information:

  Supply voltage range = DC + -25V to DC plus or minus + -55V. It is recommended to use DC voltage DC+ -40V.

  Output power RMS =50-150W 8 ohms

  Output voltage gain = pure post-stage output gain VOLTAGE GAIN=18 times,

     Front-end combined output gain (switchable with front-end output mode) = 100 times

  Switch pin pin PREAMP OFF =1-2 is pure rear-stage output, PREAMP ON =2-3 front and rear-stage combined output

  Quiescent current, adjust IQ TEST test 2 points voltage is 1MV, quiescent current is 13MA

  Output DC offset voltage (midpoint DC voltage) <1.5MV (using DC servo circuit)

  Frequency response range = 20HZ -20KHZ (-0.1 DB). 10 HZ-30K HZ -0.2DB

  THD+N = 0.005%-0.008% 15W output 8 ohm load 20HZ-20KHZ

  SR= 20V/US

  Damping factor = 100

  Recommended radiator size = more than 200 grams for mono

  Amplifier wiring instructions: power supply VCC+, GND, VEE- a total of three lines of power.

  Input signal INPUT +-, the input signal has 2 lines in total.

  The output OUT+ is connected to the positive pole of the speaker, and GND is connected to the ground wire of the speaker.

  PCB size = 82*76MM length and width

  PCB mounting hole distance = 74MM between left and right holes. Top and bottom hole distance 69MM

  The horizontal installation distance of the power tube = 2SC5200-2SD669, and the distance is 22MM. 2SD669-2SA1943 Distance 22MM

  The finished boards have been debugged, and it is generally not recommended to adjust the quiescent current again during use.
  If you have very professional experience and want to debug the quiescent current, you need to pay attention to urge the tube yard tube to work for ten minutes, the GS voltage will drop by about 150MV, which is caused by the thermal negative temperature system. Therefore, high-power tube is recommended. First, the voltage of the third pin is about 420 MV, and it will rise by 600 MV in a few minutes.
  When adjusting, you need to measure the quiescent current of the IQ TEST test point after the amplifier has been working for ten minutes.

• The following figure is the waveform obtained after the initial adjustment of the E210 by LJM, and the adjustment is made according to the characteristics and experience of the sound. Make the sound more in line with the sense of hearing.