Reviews Audio Preamp Circuit

Douk Audio T3 PRO MM Phono Stage Preamp Mini Stereo Vacuum Tube Preamplifier

With MM signal input and 3.5mm AUX input(with priority), can be used as a MM phono preamp and a tube preamp, compatible with many audio devices such as MM record player, phone,TV, MP3 players, CD players, DAC, computers etc. to satisfy different demands..
Reasonable curcuit layout and concise wiring to ensure HiFi clear sound with low noise, adopting 2PCS 6A2 vacuum tubes(can be replaced by 6K4 / 6J1 / 6J4 / GE5654 / 6AK5 / 6*1n) to make sound warm, dynamic and sweet, bringing extremely high-quality listening experience..
With gain adjustment switch(OFF-39dB-42dB-45dB), convenient to match better with different audio signals, the front panel are machined with wire drawing and frosted technology, looks more fashionable and distinctive..
Mini size with exquisite appearance, aluminum alloy chassis with better shielding performance and gold-plated terminals with lossless transmission, perfectly suitable for MM record players and other audio sources..
Notice: this is only a preamp, which needs to be used with amplifiers or active speakers..

Connect any turntable to a wide variety of audio systems. Perfect for DJs and vinyl enthusiasts.
Moving Coil/Moving Magnet switchable input.

Inputs: 4 x Stereo RCA, 1 x Optical, 1 x Coax.
Outputs: 1 x Stereo Rec Out, 1 x Stereo Pre Out, 2 x 3.5mm Jack (Power control), 1 x pair of speaker connectors.

Inputs: 4 x Stereo RCA, 1 x Optical, 1 x Coax.
Outputs: 1 x Stereo Rec Out, 1 x Stereo Pre Out, 2 x 3.5mm Jack (Power control), 1 x pair of speaker connectors.

CONVERTS PHONO SIGNALS: A turntable preamp that converts phono signals to Line Level Signals. This state-of-the-art circuitry phono preamp can accommodate magnetic pickups with an input sensitivity of 3mV at 50K Ohms.
LOW NOISE OPERATION: Offers outstanding performance with it’s Low-Noise Audio Operational Amplifiers. The output is 2V max (P-P) at 10K Ohms. It’s better to position the preamp close to the source to reduce unwanted noise and interference.
CONNECTS TO TURNTABLES: Connect any turntable to modern sound equipment without specialized phono input for amplifying music. For the receiver, this can be connected to speakers, computers, laptops and more.
2-Male to 2-Male RCA audio cable enhances audio connections.
ideal for home-entertainment and high-fidelity (HiFi) systems.
2 RCA output (connect to either L or R input) and 2 RCA input.
input can be high frequency (digital audio) or low frequency (subwoofer).
Corrosion-resistant 24K gold-plated full-metal connectors.

...AC Adopts the Texas Instruments NE5532 high-performance operational amplifiers chip combining excellent DC and AC characteristics. Q4 features very low noise, high output-drive capability, high unity-gain, and maximum-output-swing bandwidths, low distortion, high slew rate, input-protection diodes, and output short-circuit protection.Q4 has specified maximum limits for equivalent input noise voltage..
160mW RMS(32 ohms, 20 Hz - 20 KHz, 0.01% THD), with bass and treble control Q4 can be used as preamp or volume controller for your PC/Computer/MAC/headphons/speakers system. Easy to set up. No special software, app, or driver to install, a true plug-and-play digital audio adapter..
Mini compact D/A converter, full metallic shell to ensure high quality. Stream bit-perfect 24bit/192KHz HD with low jitter, with output protect circuit, safe for your expensive audio system..
What You Get: Q4 USB DAC x1, USB charging cable x1, optical cable x1, PC-USB to type B cable, User Manual x1, our worry-free 18-month warranty, and friendly customer service..

This product uses high quality fully-balanced potentiometers, NEUTRIK XLR, Pro-Singnal RCA. Nobsound never be stingy in the components and materials of our products..
This prodcut has a small size, while is still euipped with commonly-used interfaces. There is a selection switch which you can choose the fully-balanced or single-ended audio signal mode, as well as the output or input mode..
This prodcut has no amplifying circuit and won't change the timbre. You can enjoy the most original sound of your active monitor speakers..
Its clean black appearance suits for almost every usage scenarios..
Please note this is a passive preamp, which means it has no amplifying function..

DESIGN: OSD Audio’s Pre-1 is a unique preamplifier that accomplishes the subtle audio tasks that takes an ordinary audio source management to the next level..
SOUND QUALITY: The Pre-1 assists in experiencing a true home theater surround sound. It allows the ear to hear every detail for an enhanced audio environment..
POWER: A low frequency filter gives a response of 5Hz-30kHz +0 -3dB in order to have the ultimate powered preamp for a home recording or stereo system..
CONTROLS: The front panel has adjustable mic level control, input selector, microphone jack output, and mute option. It controls the bass for midrange, treble, loudness and balance control..
SIGNAL: A preamp is an important element for music recording to boost the low-level output on microphones. It provides a better recording signal compared to standard equipment..

RCA/Bluetooth Audio input Manual switch mode, With DC12V/1.5 A power supply(Do not use a power supply exceeding 12V).
RCA input to the computer, CD, phone, iPod and other player and RCA output to the digital amplifiers, active multimedia audio devices for lossless audio(The RCA cables not included).
With treble and bass adjustment,Using tube 6N3 design for easy replacement(6N3,6H3,396A,2C51,12B4A,GE5670,6H3n-E),soft voice.Adopt the Dual run amplifier chip NE5532P power conversion module.
All aluminum alloy shell,heavy gold PCB,Build quality is surprisingly solid,Nice touch!With optimal integrated circuit to get powerful, dynamic and sweet sound.
This product is a preamplifier,not a power amplifier or phono preamp, can't be used for turntables or passive speakers.It needs to be connected to an Powered speaker and a rear amplifier(Can offer technical support and warranty service!Pls Ask Me:www.amazon.com/hz/help/contact/A3BG62S1F23IH5# .thanks!).