Equipped classic preamplifier NAIM NAC42.5 Preamplifier Finished Board
Note: This is a welding and testing of the finished board OK.
Summary:
NAC42.5 preamplifier praised in the UK. The British thought it was the most beautiful preamplifier in the world. Circuit with UK NAIM original circuit. Although a bit exaggerated, you can still think of "NAC42.5" as high praise.
Using Toshiba low noise audio signal tube and tantalum capacitor input and output coupling capacitance.
Using precision voltage reference source ONSEMI M-otorola LM317T + OSCON polymer semiconductor capacitors as decoupling filter capacitor. Additional capacitance with high capacitance and inductance as secondary filter. Effectively reduces power supply noise.
PCB size: 65mm * 87mm
Input voltage: AC single 20V - single 24V
(You can also use two serial 10V or 12V implementations for single AC 20V).
SNR: 100DB
Voltage gain magnification: 11x
THD + N: <0.05%
Frequency response: 20Hz-20KHz -0.2db
Input impedance: 330K
Quiescent current: 22mA
Package:
1pc assembled classic preamplifier NAIM NAC42.5 preamplifier ready board