Assembled classic preamp NAIM NAC42.5 Preamplifier DIY/finished board
DIY Kits All parts need you welding and testing
Specifications:
SN”100 DB
PCB size is 60*86 MM
Voltage gain magnification = 11 times
THD+N < 0.05%
Frequency response = 20HZ-20KHZ -0.2 DB
Input impedance 330K
Static working current 22MA
Filter Capacitor Using Original Panasonic FC Black Leather Audio Capacitor
The signal coupling capacitor adopts the U.S. imported straight-through tantalum capacitor.
The NAC 42.5 predecessor was widely acclaimed in the UK and was considered by the British as the best in the world.
Although it is somewhat exaggerated, you can still think of NAC42.5’s high praise.
Adopt TOSHIBA audio ultra low noise signal tube. Adopt imported tantalum capacitor. Input and output coupling capacitor.
Power supply range: AC single 20V to AC single 24V.
You can use a single 10V or dual 12V AC in series to get a single AC20V.
Precision Voltage Reference Source ONSEMI Motorola LM317T plus OSCON Polymer Semiconductor Capacitor
As a decoupling filter capacitor
Add LC bulk inductors as secondary filters.
Effectively reduce power supply noise.
The circuit uses NAIM UK Inscription Original circuit
Package:
1pcs board

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