LG112C UK NAC 42.5 CLONE Single-ended preamp: NAC (Naim) 42.5 pre-level is widely acclaimed in the UK and is considered by the British to be the best pre-level in the world. Although a bit exaggerated, you can still imagine the high praise of NAC42.5, and the price of its amplifier is still strong.
The circuit uses NAIM UK's list-side OTL design. Each stage uses a single-ended class A design. The output stage uses a single-ended + constant current source load with a quiescent current of approximately 20 mA.
The sound of the single-ended type A is noble and charming, and has a strong musical taste. The overall listening is easy and pleasant.
Exquisite FR4 double-sided fiberglass board, Shenjin high-quality PCB board, 2mm thick, 72渭m thick copper foil. The size is 115 x 107 mm. The Japanese TOSHIBA Toshiba audio tube is used to match the icon. Sweden RIFA or Germany ERO 10U100V MKT film capacitor input, Nissan ALPS 27 blue shell potentiometer volume control, Germany WIMA Wei Ma 15U63V film capacitor output, Japan KOA 1/4W color ring high precision resistor, Japan ELNA 47渭25V gold word electrolytic decoupling, Two-way input selection. On the board with rectification, filtering, voltage regulation, AC single 24V power supply, 4A full bridge rectification, 6 Sanyo or chemical electrolytic filter, three-terminal regulator 7824 and OPA2604 form a single voltage active servo circuit, effectively reducing the internal resistance of the power supply, reducing The power supply noise improves the sound quality, directly connects the headphones without any noise, and the signal-to-noise ratio is greater than 100 DB. There are holes around the board, and 4 fixed copper columns can be assembled. The finished board weighs 0.22KG.
The original machine is coupled with tantalum electrolysis. This part is coupled with a small-volume German ERO and a German WIMA Wima film capacitor, and the sound effect is obviously improved.
The circuit board can be powered from 22V to 26V. It can also be connected in series with dual 12V AC to get 24V AC.
The board has black and blue, not picking
Board code: LG-112C
Affirmation: The components on the finished board are different due to different assembly batches. The types, brands, models and specifications of some components will be slightly different. The components and parameters on the board will be subject to the acceptance! Some components on the circuit board are second-hand disassembled products, and the finished board inspection is normally sold.
1pcs锛?/span>90 days after receipt of order 锛?nbsp;
