Description:
Features:
L25 combined power amplifier finished board.
It is a combined amplifier with low distortion, high driving force and high power designed by LJM Dual-channel, a total of two circuit boards.
Each channel uses four pairs of original KTB817 KTD1047 transistors
The LAPT type audio famous tube 2SA1186 2SC2837 is used as the driving tube.
The front stage uses the original JRC4580 DD ultra-low noise, ultra-low distortion operational amplifier. Uncoupled DC amplification.
Using aviation-grade PCB material technology.
Output power 250W 8R, 500W 4R + -70V power supply.
200W 8R, 400W 4R + -63V power supply.
125W 8R, 250W 4R + -50V power supply.
250W 4R, 500W 2R + -50V power supply
Maximum output current 20A, maximum output voltage sine wave + -67V. (+ -70V power supply)
Quiescent current 20MA per channel
Static power consumption = supply voltage * 0.02 (2W+ -50V)
Power Supply Voltage: +-24V to +-70V
Recommended supply voltage and radiator standard:
+ -35 to + -50V, radiator 0.5KG per channel
+ -40 to + -60V, radiator 1KG per channel
+ -60V to + -70V, the radiator is 2KG per channel.
If you use a voltage above +-60V. Due to the high heat generation, it is recommended to apply silicone grease on the back of the angle aluminum.
Good heat conduction with large radiator.
The gain of the front stage is 4.7 times. The gain of the rear stage is 25 times. The total gain is 117 times.
Frequency response range 5 HZ-300 K HZ -3DB. 20HZ-20K HZ + -0.2DB.
Distortion 100W 1K HZ THD <0.01%
Damping factor> 3000, 8 ohm load.
S/N ratio>97DB.
Input sensitivity: 0.6V RMS 250W 8R power
Packing: LJM Dual Channel L25 Pre-stage Post-level Combined Power Amplifier LAPT 2SA1186 2SC2837 Drive Tube KEC KTB817 KTD1047 Finished Board