Description
Description:Two-channel kit: two boards, two-channel, DIY kit, you need to bring your own welding tools and assemble it yourself;L12-2 power amplifier rear stage kit. The high-performance amplifier designed by LJM is strictly tested.L12-2 is mainly monitor-based, ultra-low distortion amplifier.The first thing to note is that the lowest distortion does not mean that it may be the best listening amplifier.L12-2 is more suitable for professional users who have very high accuracy requirements for details.It's voice tends to be colder and harder. requires attention.Circuit diagrams are not provided for all LJM models. Do not buy if you mind.
Parameters:
The supply voltage is within ±55V.Power = 120W /8R + -50V voltage 200W 4R + -50V voltageTHD<0.0005% 1K HZ 10WSR = 35V/USDamping factor>200, 8ohm loadInput sensitivity=1.6V output 120W 8RFrequency response range = 15HZ-50K HZ (-3DB)20HZ* 20K HZ =-0.02 DBQuiescent current = 80MAVoltage range = DC positive and negative double voltage ±12V ~ ±55VVoltage amplification factor = 31 times
L12-2 has more than thousands of users since 2006, and they have received very good feedback. It is a classic model in the L series.Stable and reliable, first-class performance. L series amplifiers are strictly measured by various instruments, which are by no means similar to copycats of various brands on the Internet.The L series have been researched and improved for a long time for several years, as well as reliability testing, please rest assured to use.The spare parts need to be welded by themselves, as shown in the figure after installation:
Test chart:Input signal -THD+N testWhen the input voltage is 700MV, the output voltage is about 23VPP and the load is an 8 ohm resistor.The following figure test: using 8 ohm 1000W power resistance.
PCB adopts 2MM thick material 75 UM thick copper film.The circuit I designed uses asymmetric amplification, cascode input, single-ended constant current amplification, and complementary feedback output stage.The voltage magnification is 31 times.The quiescent current of each channel is 40MA, working in CLASS AB.The small signal tube uses the original low noise tube, and the original ON low noise tube is used as the current source and voltage amplifier.The output tube adopts the original imported Sanken ultra-high frequency FT 70M, and the multi-emitter LAPT audio tube.2SA1186 2SC2837, two pairs of output tubes per channel.The user-friendly installation method, one channel only needs to install the big tube on the radiator.And the big tube can be installed on different radiators arbitrarily.Under +-50V. 8 ohm load can output 120W power.The test load is 6.6 ohms.
Package included:
2PCS LJM L12-2 Power Amplifier Kit
