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NAD Discrete Tone Preamp Amplifier 8 Times Gain
2SA992 2SC1845 Preamplifier Home Hifi Audio
This machine refers to the tone part of the British NAD3020 power amplifier, carefully designed layout, advanced all-aluminum chassis (volume knob is solid aluminum car), 2-way audio signal input switching selection control, copper gold-plated RCA, wiring adopts tree-type grounding wiring grounding method, The signal-to-noise ratio is high, the fever components are assembled, the circuit adopts the single-ended class A amplification form, and the amplifier tube adopts the Japanese original high magnification factor (HFE): 2SA992/2SC1845 audio dedicated pair tube, Japan nichonic Nikon, Panasonic and other fever electrolytic capacitors, military 718 Factory copper foot metal film resistor, power supply using a 30W high-grade toroidal transformer (copper wire, A-grade silicon steel), LM317/337 high-precision voltage regulator IC power supply, volume potentiometer using Japanese original ALPS16 type high-quality potentiometer, high and low tone Using 2 Taiwan-made SONG high-quality potentiometers, durable. The biggest feature of this tone is to adjust the high and low frequencies, and the intermediate frequency is almost unchanged.
Line gain 8 times
Treble adjustment range ±10DB
Bass adjustment range ±15DB
Signal-to-noise ratio: high-bass potentiometer, the volume potentiometer is turned to the maximum, and the ear is close to the speaker to hear the bottom noise
Precautions for use: Turn on the front stage first, then turn on the rear stage, turn off the rear stage first, then turn off the front stage, so that there will be no impact sound when switching on and off.
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