Classic HI-END Base On Lehmann Class A Headphone Amplifier LEM Preamplifier DIY Kit/Finished Board With Protection

Introduction:

◆ Base on original Lehmann circuit, add earphone output protection circuit to protect your expensive earphones.

◆ The purple double-sided gold plated PCB has a very good process, and the gold plated process can effectively reduce the contact resistance.

◆ New and original German WIMA stepless capacitor, ERO decoupling capacitor, Nichicon KG 4700uFX2 large filter capacitor. Imported self recovery red fuse.

◆ ST brand new original BD139, BD140, F brand new original BC550, BC560.

◆ Use BB OPA2134PA original transport amplifier.

◆ The resistance adopts a new 718 military copper pin 5% metal film resistance.

◆ The volume potentiometer adopts the original Japanese ALPS-27 potentiometer and the Swiss Neutrik 6.35 headphone output block.

◆ PHILIPS BYV27 high-speed rectifier tube and ON LM317/337 linear voltage stabilizing j circuit are used. Compared with previous versions, the importance of power supply voltage stabilization is known.

 

Parameters:

Input voltage: AC 18V-0-18V

Frequency response range: 10Hz-35kHz

Adapting impedance: 8-2k ΩDistortion:<0.001% (6mW/300 Ω)

Output power: 200mW/300 Ω, 400mW/60 Ω

Input interface: Analog signal

Output interface: 6.3mm interface × 2 and Analog preamplifier signal output.

PCB Size: 150mm*105mm (Double-sided gold plated)

 

 

NOTE: We have DIY kit or Finished board (Optional)

◆ DIY kit ---- All parts need you to solder and test it.

◆ Finished board ---- All parts have been welded and tested OK.