1pair LJM L12-2 Ultra Low Distortion Power Amplifier Board 120W 8R / 200W 4R AMP
L12-2 amplifier post stage kit. A high-performance amplifier designed and rigorously tested by LJM himself.
L12-2 is mainly a monitoring based, ultra-low distortion amplifier.
Firstly, it should be noted that the lowest distortion does not necessarily mean it may be the best sounding amplifier.
L12-2 is more suitable for professional users who have very high accuracy requirements for details.
Its sound tends to be colder and harder.
Please note that all LJM models do not provide circuit diagrams. Don't buy if you mind.
Parameters
Power = 120W /8R + -50V voltage
200W 4R + -50V voltage
THD<0.0005% 1K HZ 10W
SR = 35V/US
Damping factor >200, 8ohm load
Input sensitivity=1.6V output 120W 8R
Frequency response range = 15HZ-50K HZ (-3DB)
20HZ* 20K HZ =-0.02 DB
Quiescent current = 80MA
Voltage use range = DC positive and negative dual voltage + -12V to + -55V
Voltage magnification = 31 times
Improvement compared to VER4 version in VER5 version
1. Replace low-power transistors B649 and D669 with medium power transistors A1837 and C4793,
2. Increase the static current of the driving power transistor from 6MA to 18MA.
3. Add a radiator to the medium power tube.
4. Increase the static current adjustment function of the output power transistor, so that the static current of the left and right channel circuit boards can be the same.
5. Use electronic filters to replace the previous RC passive filters and reduce input stage interference.
6. Change the input stage mode to increase the input impedance. Low frequency performance improvement.
Package
1pair DIY L12-2 Ultra Low Distortion Power Amplifier Board 120W 8R / 200W 4R AMP
The following figure test: using 8 ohm 1000W power resistance
