Product Details:

① This is a DIY KIT, you need to solder the assembly yourself.

② Refer to the tone part of the UK NAD3020 amplifier, using double-sided thick gold-plated PCB (substrate 2MM, copper foil thickness 75U)

③ The circuit adopts single-ended type A amplification, and the amplification tube adopts Japanese original high magnification (HFE300+): 2SA992/2SC1845 audio dedicated tube.

④ The latter two pairs use B647/D667 audio dedicated tube, military 718 factory metal film resistor, voltage regulator circuit uses new LM317/337 high precision low noise regulator IC, new revision upgrade ELNA electrolysis, Panasonic FC gold electrolysis, Taiwan potential Device.

⑤ The biggest feature of this project is to adjust the high and low frequencies, the medium frequency has almost no change, and the low frequency is full of elasticity! High frequency is not harsh! The tone is very mellow and very resistant! The effect is not comparable to the op amp pitch.

⑥ High and low sound adjustment range: bass +-15DB, treble +-10DB

⑦ Potentiometer distance from left to right: 40MM, 58MM

⑧ Gain: 8DB

⑨ Size: 138*81MM

⑩ Working voltage: AC24V--0V--AC24V (We have the right transformer, please contact me if you need it)

Package list:

1 × NAD preamplifier board kit   (If you need a finished board, please contact me)

The following is the assembeld board photos, just for reference only: