12 best tube preamps

• P1 is a Bluetooth vacuum & valve tube preamplifier and headphone amplifier. Headphone output is 160mW @32Ω and is suitable for 32~300Ω headphones and headsets.
• Classic 6J5 vacuum & valve tube can provide warm retro tube sound. It can be replaced by 6J1, 6J4, GE5654, 6AK5, 6Ж1n-EB.
• It supports Bluetooth/USB/RCA inputs from various devices like iPod, Phone, MP3, TV, Blu-ray players, Echo Dot, CD players, computer etc.
• Bluetooth 5.0 supports APT-X, APT-X LL lossless transmission. PC-USB supports 24bit 192KHz and is compatible with Windows/Mac/Linux system
• Treble & bass control can achieve different sound style. Bypass function can suspend the tone control circuit to achieve purer music experience.

User questions & answers

Question:	Can this pre-amp stay on for long periods of time without damaging the tubes? Or can the tubes be switched off & still pass through to my amp
Answer:	Tubes last around 5000 hours. They can be on all the time.
Question:	Can you run this amp with powered speakers
Answer:	Confirmed working fine with JBL Professional LSR310S Powered Subwoofer and JBL LSR305 powered monitors. Sound does seems a bit tinny, perhaps better tubes would help.
Question:	Is this a DAC as well as a preamp
Answer:	Description states a CM6642 dac. How it's wired up will make a difference, have one on order.
Question:	Can I send audio out from the rear usb port into a computer usb to make recordings on audacity
Answer:	No. the USB port is only for power and receiving data from the PC. It does not send data to the the PC at all.

Product features

Parameters

• Chip Architecture: CM6642+QCC3008+NE5532+classic 47
• PC-USB Input Sampling Frequency: 192K/24Bit
• THD: 0.01% , SNR: 103dB
• PC-USB System supported: XP/W7/W8/W10/MAC/Linux
• Bluetooth VER: 5.0
• Headphone matching impedance: 32-300Ω
• Headphone Max power output: 160mW 32Ω load
• Bass & Treble Range: ±6dB
• RCA output level: 2.3V
• Frequency Range: 20Hz-20kHz(±3dB)

Bluetooth / USB / RCA Inputs & Preamplifier & Headphone Amplifier

• Bluetooth vacuum & valve tube preamplifier and headphone amplifier
• Headphone output is 160mW @32Ω and is suitable for 32~300Ω headphones and headsets
• Support Bluetooth/USB/RCA inputs from various devices like iPod, Phone, MP3, TV, Blu-ray players, Echo Dot, CD players, computer etc
• Bluetooth 5.0 supports APT-X, APT-X LL lossless transmission
• PC-USB supports 24bit 192KHz and is compatible with Windows/Mac/Linux system

Warm Tube Sound & Replaceable Vacuum Tube & LED Selector

• Classic 6J5 vacuum & valve tube
• Warm retro tube sound
• Can be replaced by 6J1, 6J1, 6J4, GE5654, 6AK5, 6Ж1n-EB
• Tube light selector (blue / orange)

Treble / Bass Control & Bypass Function

• Support treble and bass control
• Bypas function (tone control can be turned off to achieve purer music experience)
• Bluetooth / USB / RCA input selector

• This Bluetooth 5.0 Vacuum tube preamp,With Bass and treble,Sound quanlity really good,Let you enjoy sweet and warm sound quality.(Note:Cannot be used on a record player and phonographs)
• AUX / Bluetooth Audio input Manual switch mode, See the product description for more details,With DC12V/1A power supply(Do not use a power supply exceeding 12V)
• Using the classical tube 6j1 design for easy replacement,Designed so the tube can be replaced, soft voice.Adopt the Dual run amplifier chip NE5532P power conversion module
• Build quality is surprisingly solid,Nice touch!The power circuit is completely separate from the audio circuit, Minimizing interference for clear sound
• This AIYIMA Tube A3 PRO is a preamplifier. It is not an audio amplifier. It needs to be connected to an active speaker and a rear amplifier

User questions & answers

Question:	I bought to use with my computer audio into stereo amplifier and passive speakers. is there a diagram on how to connect
Answer:	Yes, Google it.
Question:	What is the output impedance
Answer:	No,this is a tube preamplifier, not a tube amplifier,impedance and power is decided according to your power amplification,hope you can understand,thanks
Question:	Is it suitable for mm phono cartridge
Answer:	No, this preamp is not suitable for direct use with a record player. There isn’t enough gain and it lacks the RIAA equalization.
Question:	Just purchased this unit. when i turn on the power switch the led light below it flashes red and blue. is there a problem with the unit
Answer:	Hi sir,Red and blue flashing is the status of bluetooth waiting to be connected,Blue light indicates bluetooth connection is successful ,Only display Red light is AUX status,so pls check your use status, Use the select button on the back of the preamplifier to select the function you need,Hope it can help you,and thanks for your remind,we will add this information on our description.Any problem,pls contact us,thanks.

Product features

Bluetooth/RCA input modes seletable

The output is made of gold-plated RCA lotus seat, which is durable and beautiful!

The board layout is reasonable, beautiful, and the current is small

Bluetooth 5.0 Lossless transmission

Using original 6J1 Tube, Bluetooth 5.0 version;

Tube can be replaced with:6J1/6J2/6J4/6K4/GE5654/6AK5/6Ж1п

With Treble Bass Control

Treble & Bass control can achieve different sound style. Tube A3 PRO is a perfect Tube preamp for your home Audio Amplifier system,use it can to achieve purer music experience.

AUX/Bluetooth input Cutover Function

When you cutover to AUX Working mode,It's Red Light indicator

Switch working mode

Depress to switch bluetooth mode;

Red and Blue flashing;

It's the status of Bluetooth waiting to be connected.

Bluetooth mode

Bluetooth connection is successful;

It's Blue Light indicator

6J1 Vacuum Tube Preamplifier With Bluetooth 5.0

1. The product is a Vacuum tube preamp, not a power amplifier or phono amplifier.And it can not be used in cars,turntables ,also cannot be used directly for headphones, speakers,pls see the product Connection Diagram！

2. Do not use cheap audio signal lines These lines are not shielded by themselves.the probability of the bottom noise current is very large, it is recommended to use a good audio cable or power supply.

3. Make sure that there is no problem with your own audio source. The preamplifier has its own preamplifier function. If the audio source itself has noise, then the preamplifier will only amplify its noise.Please use a good sound source test.

4. Check whether the tube is plugged into the base before to use.Be sure to the machine is energized and working normally.

5. The preamplifier has 3-5 times power amplification. If the sound is broken, you can adjust the volume control to control the power output to prevent breakage.

6.Because the production batch is different,Blue/AUX input select button have a little different,Pls know it.

More technical support,pls ask me:www.amazon.com/hz/help/contact/A3BG62S1F23IH5# .Or leave any of your instant messaging account and I'll contact you.thanks!

• ❤Tube MM Phono Preamplifier: Converts phono signals to Line Level Signals with low-noise integrated circuits and high-quality components to remove low-frequency noise ensure clear sound quality. Designed with grounding post to protect your turntable.
• ❤Three switchable gain modes: 39, 42, 45 dB. Adjustable gain levels to give you customizable control and outstanding compatibility. Entry-Level high-end analog sound and top-notch circuitry for an unbeatable low cost.
• ❤Tube Preamplifier: It's also a tube preamp with 3.5mm AUX Input. Designed and assembled by Fosi Audio from high-quality components. Great warm, smooth-sounding.
• ❤Applicable vacuum tube model: 6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc. You can replace the vacuum tubes to DIY your stereo system. Different tube with different sound.
• ❤What You Get: Box X2 phono preamp x1, Vacuum tubes x2, RCA cable x1, power adaptor x1, user manual x1, 18-Month global warranty, and 24-Hour quick customer service.

Product features

Tube MM Phono Preamplifier/Tube Preamp

• Power Adapter Output: 12V/1.5A
• Product Adapter Input Voltage Range: AC 110V - 240V
• Box X2 Phono Preamp DC Input Voltage: 12V
• Output Voltage Level: 600 Mv @3mV 1kHz
• SNR ≥ 98dB
• THD ≤ 0.1%
• Frequency Response: Standard RIAA
• Product Weight: 0.66 lb/300g
• Product Dimensions: 4.66 inch/3.85 inch/1.29 inch

Tube Preamplifier

Audiophile-grade amplification modules offers outstanding performance with its Low-Noise Audio Operational Preamplifiers. It's also a tube preamp with 3.5mm AUX Input. Designed and assembled by Fosi Audio from high-quality components.

Gain Adjustment

Three switchable gain modes: 39, 42, 45 dB. Adjustable gain levels to give you customizable control and outstanding compatibility. Entry-Level high-end analog sound and top-notch circuitry for an unbeatable low cost.

MM Turntable Preamp

Suitable for moving-magnet (MM) cartridges. Precise RIAA equalization. Consistent sonic performance, super low-noise. This mini preamp has stereo RCA inputs and stereo RCA outputs Connect the turntable to the RCA inputs and ground.

12V/1.5A Power Adapter

Energy-efficient and stable power supply which got authoritative certification by many security tests.

Replaceable Vacuum Tubes

Applicable vacuum tube model: 6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc.

FREE RCA Cable

Fosi Audio Box X2 preamp comes with a FREE RCA cable. Unbeatable low cost for an home audio phonograph preamp.

Product description

The SOLO/610 delivers the classic Putnam 610 tube console sound in a rugged, highly versatile mic preamp design. This unit provides the silky, vintage warmth of the original console's mic amp design, and will flatter any microphone or instrument with its signature sound. Thanks to its convenient form factor, the SOLO/610 can be used in the control room or the recording room, on stage, or on a desktop. Functionally lean but sonically mean, the SOLO/610 maintains the character of the 610 console - at a price every serious project studio can afford. The SOLO/610 offers Mic and DI inputs, and features Gain and Level control for a wide variety of clean to colored tones. Unlike its predecessors, the SOLO/610 has continuous Gain control with even greater range, allowing for more precise gain structuring - doubling as input signal padding. The SOLO/610 has all the essential features like 48v Phantom Power, Lo-Cut filtering, Phase Reverse and flexible dual impedance selection for both Mic and DI inputs. The SOLO/610 includes essential DI features like Thru (for use with an amplifier), as well as Ground Lift and Mic/Line level output switches.

• Classic Putnam 610 console mic preamplifier and DI
• Legendary all-tube sound, at a project studio price
• Gain, Level, and Impedance selection for maximum tonal variety
• Hand-built in USA

Product description

Notice:

As a phono preamp, it is suited for MM turntables only. Do not support MC turntables.

As an AUX preamp, it is suited for devices like CD, DAC, PC, cellphone.

Please note as a phono preamp, it can only work with MM turntables. Please note your turntable should have no built-in phono preamp. If it has, please make sure there is a PHONO OUT/LINE OUT switch and you should put it on PHONO OUT position.

We do not recommend using it with class D amplifiers since most class D amplifiers have much noise.



Parameters:

1. RIAA phono part:

RIAA freq response 20hz-20kHz +/- 0.5dB, S / N ratio> 85dB

THD <0.05%, input sensitivity 3.0mV, gain 40dB

Nominal / max output 300mV / 1.8V

Output impedance 200 ohms, input 47k ohm / 220 pF

2. AUX part:

Input voltage: AC12 ~ 18V

Frequency response: 20 HZ - 20 KHZ

Input sensitivity 300 mv

SNR: 96 db

Total harmonic distortion <3% (1 KHZ)

Power range output: 0.2 W

Output impedance: 100K

Input impedance: 50K



Chassis size:

80×116×28mm



Net weight:

0.24Kg (0.55Kg with package)



Package includes:

1 x preamplifier

1 x power supply

2 x 6J1 tubes



What's more:

It will be better if its GND jack can be really connected to the ground, which can decrease the background noise to a very low level.

For MM turntables, please check whether your MM cartridge is the old version. If so. we suggest you to upgrade it as a new version one will bring much better sound.

Please keep T7 away from devices that can transfer signal like cellphones and routers.

• This product can be used as a MM Turntable Preamp or a HiFi Tube Pre-Amplifier and can provide high fidelity and warm sound beyond your expectation.
• Please do not connect T7 to any inferior Bluetooth digital amplifiers except Class T digital amplifiers, since all Class D amplifiers have very loud background noise.
• Its tube(6J1) can be directly replaced with tubes like 5654, 6AK5, EF95 .etc
• Its mini size makes it more portable and be suited for a variety of scenarios and Its alluminum body makes it strong and elegant.
• Upgrades of the new version: ① The gain switch is moved from inside to outside. Customers can adjust its gain more conveniently; ② The circuit is optimized and the noise is lower.

User questions & answers

Question:	Has anyone used this successfully with a class d amplifier like the smsl ad
Answer:	Had to look this amp up, well it depends what you are using it for to boost your headphones using the 3.5 mm headphone jack but you would have to convert the RCA output jacks to 3.5 mm to feed your headphones. If you are using it to boost the line in to the ad18 you would have to convert the RCA jacks also and use the aux 3.5 mm input only good for 2 channel analog stereo it won't work passing digital through it
Question:	I have a sony ps-6 turntable and a sony ss amplifier ta-2650, could this phono preamplificator works fine if i connect to any of the aux inputs
Answer:	I will share my experience. I have a Technics SL-Q200 and I ordered a ground cable. The Little Bear comes with its own ground cables that looks like roach clips on both ends. I used the Technics ground cable and roached clipped it. I added a small screw in the hole of the Little Bear ground and roach clipped it and that solves the ground. You can replace the left tube with a Jan GE 5654W tube for better articulation and clean robust sound - two 6J1 was a bit noisy. It will still need the 6J1 tube provided to operate on the right slot from front. It should work fine connecting to aux input but be mindful of the grounding required.
Question:	It lookes like it has a aux and phono switch. does this mean i can use it with cd player also
Answer:	Most likely it would work as long it is a decent player and isn't prone to external noise like household appliances, that noise will get amplified along with the desired sound
Question:	Does it introduce much noise into the music
Answer:	This little preamplifier does not introduce noise, with better tube you can reach a smooth sound. A nice equipment at a nice cost.

• ♪ HIGH QUALITY MATERIALS—The chassis of the preamplifier is made of a solid aluminum alloy material, and uses accurate and stable integrated circuits and high-quality components to eliminate low-frequency noise and ensure clear sound quality; The material of its PCB board is made of FR-4 insulation board and black immersion gold Craft, which has the characteristics of stable signal, high temperature resistance, long service life, and not easy to be oxidized.
• ♪ EXQUISITE APPEARANCE DESIGN—FX AUDIO pre-amplifier has a mini exquisite appearance and light weight, easy to carry around, its brushed texture surface and high-quality tube combine to appear more fashionable ,elegant and Classical.
• ♪ SEPARATE CONTROL OF BASS&TREBLE—The vacuum tube preamplifier can independently adjust the bass and the specific proportion components in high-frequency sound to perfectly achieve HiFi effects. At the same time it can maximize the rendering of an atmosphere like being in a music performance to satisfy your experience of different sound styles in pursuit sound quality.
• ♪ RCA INPUT & OUTPUT—From RCA output ,the preamp can also be directly connected to the audio source and active multimedia audio equipment or indirectly connected to passive audio through the power amplifier(The item includes RCA cable).
• ♪ NOTE—The item just is a tube preamp, not a power amplifier or phono amplifier. Because it is a household circuit design, the home theater tube preamp can not be used in cars, turntables or passive speakers, nor can it directly work for headphones, speakers and can not be used as a phono amplifier.(Only suitable with 12V power cord).Package Include: 1 x tube preamp, 2 x 6K4 tubes,1 x power supply, 1 x RCA cable,1 x user manual, 1 x security card/1 year warranty

Product features

In order to dedicated to serve audiophile and display our cultural concept of "enjoy music,enjoy life", FX AUDIO developed the mini electronic tube preamp.

FX AUDIO tube preamplifier is designed by using aluminum alloy shell, PCB board of black immersion gold craft and gold-plated interface, mainly to enhance the weak voltage signal from the audio source and control the sound quality to achieve the effect of beautifying the sound.

Adopt 6K4 Vacuum Tube Design

The audio preamplifier is designed with two 64K vacuum tube, which can simulate natural sound,that is soft and delicate, dynamic and pleasing, strong and powerful, and very penetrating. FX AUDIO Pre-amplifier is the best choice for the friends who have high pursue with the sound timbre. (The tube can also be replaced according to personal preference).

HiFi Sound Quality

The function of the audio quality control of the audio preamplifier is to control the frequency characteristics of the audio system to achieve high-fidelity sound quality, or to modify and beautify the sound according to the listener's preferences, but also to adjust the sound range to achieve balance Make the resolution of sound more natural and transparent.

Wide Compatibility

FX AUDIO tube preamplifier have a wide compatibility,which input can be connected to various audio source equipment, including mobile phones, computers, CD / DVD, etc. From RCA output ,the preamp can be connected the power amplifiers to use ,also can be connected directly to an active speaker.

Product description

This electronic preamplifier stands up to the test and will provide you with serious sound performance. The PP444 is perfect for bringing your studio equipment's phono-level output to a more suitable line-level output. It'll take your audio signal, amplify its strength and prepare it for further processing by your receiver or amplifier. Preamps technically provide voltage gain to your desired equipment and are key to assisting the signal source, whether it's a turntable, musical instrument or microphone. The ultra-low noise audio conditioning circuitry allows the preamp to boost audio to levels that are more manageable for various types of audio equipment. You'll find it easier to adjust the recording level volumes of different sources from microphones and instruments alike. You should position your preamp close to the source to reduce unwanted noise and interference. Preamps can sometimes come built into the stereo equipment, but if that's not the case, the PP444 is an easy install, wise choice and great addition to any musician or producer. Take your sounds and audio production skills to the next level with the PP444 Preamplifier. Features: Converts Phono Signals to Line Level Signals State-of-the-Art Circuitry Accommodates Magnetic Pickups Ultra-Low Noise Operation Improves Sound Performance Connects to Turntables and Other Studio Equipment Input Sensitivity: 3mV at 50K Ohms (Phono) Dedicated RCA and 1/4" Output Connectors Output: 2V max (P-P) at 10K Ohms DC 12-Volt Power Adapter Included Frequency Response: 20 Hz ~ 20 KHz ±2dB S/N Ratio (A-WTD): 70 dB - Output Level: 2V THD: 0.08% @ 1KHz and 3mV Input | S/N Ratio: 70dB Input Sensitivity/Impedance/Phono 3 mV/50K Ohms Load Impedance: 10K Ohms - Reference Voltage: 1V d Dimensions (W x H x D): 3.54" x 2.13" x 1.02" Sold as: Unit Weight: 0.85 lbs.

From the Manufacturer

&

	PP444	PP555	PP999	PHE300	PHE400
	Turntable / Phono Pre-Amplifiers			Noise / Hum Eliminators
Jacks	RCA & 1/4''	RCA & 1/4''	RCA	1/4'' TRS	1/4'' TRS & XLR
12V DC Adaptor	✔	✔	✔

• 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
• SIMPLE PLUG & PLAY: This mini preamp has stereo RCA inputs and stereo RCA outputs Connect the turntable to the RCA inputs and ground Then, connect the amplifier receiver to the RCA outputs
• 1 YEAR WARRANTY: We guarantee this electric phono preamplifier with both a 30 day no hassle money back return policy and a 1 year manufacturer’s guarantee

User questions & answers

Question:	Does this thing have an/off switch or do you need to plug/unplug everytime you use it
Answer:	no switch. You can plug/unplug, I leave it plugged in all the time.
Question:	Unit works fine for awhile and then starts outputting static, even with no input connected. I've tried it with several amps with the same results
Answer:	Most likely people who are having noise problems it is because of ground loop isolation problem. If you have a ground loop isolation problem grounding the preamp box is unlikely to help. Without getting technical, what you want to buy is a ground loop isolator or a humm eliminator; both the ground loop isolator and humm eliminator tackles the cause of the noise at the fundamental source of the problem, depending on your audio setup, one maybe easier to use than the other. To use the ground loop isolator or the humm eliminator they generally come with instructions, or you can google this topic. If the noise in your audio system isn't fixed by using this solution the first time, try putting the ground loop isolator and humm eliminator at various points in your audio system. Also you can talk to audio people and get advice about how to fix ground loop problems from people who setup big audio systems, for concerts and such; if you talk to the average electronic garage shop audio enthusiast you are likely to get bad advice, i.e., meaningless explanations. Also caution must be used when Googling this topic, much of the discussion, advice and explanation on this topic is bogus, you can get a general correct feel of this topic if you read a number of explanations. Also one more thing that can cause a "popping noise" is that you have too much gain, this is a phono amp and the gain is huge, it takes a 3mV and makes it 2Vp-p this is a gain of around 100 to 200, if you gain up the audio signal too much then the signal out of your amplifier runs out of head room and clips, this can cause a popping sound, essentially you have too much gain. If this is occurring you need to either buy a preamp with less gain or attenuate the signal before it gets to the preamp. If this is a problem, too much gain, you can buy preamps with gain control.
Question:	My turntable has very quiet output. Will this device help boost the volume
Answer:	Yes, indeed. If your need was like mine (no built-in pre-amp on the turntable and no specifically dedicated phono input on your amplifier) you will find this unit to be the perfect solution to needed amplification of the turntable's output. Don't forget to hook up the ground wire as directed or you may wind up putting unwanted noise into the audio.
Question:	My amp DOES have a Phono Input, but my cartridges are low output. Can I use this to boost the signal using the Phono Input to reduce audible hiss
Answer:	No, you can't. This is a phono preamp with RIAA playback equalization that amplifies the signal about 100 times, so it essentially does what your built-in phono preamp does. The output signal from the separate preamp is equalized to a nominally "flat" frequency response and the amplified signal level will overload and probably damage your built-in phono preamp. Plug it into any other stereo line input on your system (AUX, CD, DVD, TAPE, VCR, etc.), but NOT the PHONO input! If you need higher signal gain, maybe look at phono preamps from ART or TCC that have output level controls. If you use moving-coil (MC) cartridges, you need a preamp specifically designed for them...they require at least 55 dB (over 500 times) signal gain vs. about 40 dB (100 times) for moving-magnet (MM) cartridges. Noise becomes a critical issue with MC cartridges because of their extremely low signal output, so good-quality cables and good turntable grounding are essential.

Product features

Pyle Phono Turntable Preamp Mini Electronic Audio Stereo Phonograph Preamplifier with RCA Input, RCA Output & Low Noise Operation Powered by 12 Volt DC Adapter

• Converts Phono Signals to Line Level Signals
• State-of-the-Art Circuitry Accommodates Magnetic Pickups
• Ultra-Low Noise Operation Improves Sound Performance
• Connects to Turntables and Other Studio Equipment
• Input Sensitivity: 3mV at 50K Ohms (Phono)
• Dedicated RCA and 1/4'' Output Connectors
• Output: 2V max (P-P) at 10K Ohms

• DC 12-Volt Power Adapter Included
• Frequency Response: 20 Hz ~ 20 KHz ±2dB
• S/N Ratio (A-WTD): 70 dB - Output Level: 2V
• Input Sensitivity/Impedance/Phono 3 mV / 50K Ohms
• Load Impedance: 10K Ohms - Reference Voltage: 1V d
• Dimensions (W x H x D): 3.54" x 2.13" x 1.02"

Product description

Twist the TubePre V2 Drive saturation control and add the “color” that only a hand-selected 12AX7 vacuum tube can deliver— from gentle warmth to total fuzz. Unlike other compact tube preamps, TubePre V2 starts with the low noise, high headroom Class A XMAX preamp input stage found in our premium interfaces and digital mixers. Discrete components and high-voltage operation deliver best-in-class dynamic range and detail not found in other single-channel tube preamps.

• 12AX7 tube-based preamp with XMAX solid-state input stage
• Gain control and Tube Drive saturation control
• Low-noise dual-servo (no capacitors) gain stage
• Separate instrument and mic inputs
• Phantom power, HP filter, -20 dB pad, and polarity-reverse
• Compact 1/3U rack-mount chassis

User questions & answers

Question:	Can i connect this to a audio interface via xlr
Answer:	No
Question:	Can i use this as a preamp for my presonus audiobox usb
Answer:	Yes, it should work fine. Your mic or instrument goes direct into the pre-amp and then just run a short cable from the output of the pre-amp into the channel input of the audio box you want to use. I got one of these recently and am pretty happy with the sound and ease of use. I did take others advice though and swap out the tube for a higher quality one which is pretty easy to do.
Question:	How to do I connect this to a Audio Interface
Answer:	This is a microphone preamp, not an audio interface. You would run your microphone to an input on this Presonus, and then there is either an XLR or 1/4 output that you would plug into another USB-type audio interface to go into a computer.
Question:	Can you run a line and XLR input through this at the same time and have each go to their respective outputs (separate)? Sort like a 2 channel pre
Answer:	I do not know if this is possible as it is a one channel pre. I would imagine the input /output is either/or. Can't say for certain without trying but I only have one mic.

Product features

From gentle warmth to total fuzz with the twist of a knob.

XMAX microphone preamps deliver incredibly high headroom, deep lows, smooth highs, and a rich overall sound garnering them rave reviews from users and the media alike. The 12AX7 vacuum tube that follows the XMAX in the TubePre V2 was hand-selected and carefully tested for electrical conformity and freedom from microphonics. Twist the Drive saturation control to add the “color” that only a hand-selected 12AX7 can deliver — from gentle warmth to total fuzz.

A versatile tool that’s built to travel.

Housed in a rugged case that is built to travel, the TubePre V2 rear panel sports separate unbalanced, ¼” instrument and balanced, XLR mic inputs and unbalanced ¼” and balanced XLR line outputs. Use it as a straight-up tube preamp or a dynamite direct box (DI) for guitars and basses. We’ve provided all of the extras you need, including a highpass filter, phantom power, polarity reverse, and a backlit VU meter. Yet with all its features, it’s small enough to carry almost anywhere—or simply screw-mount it to a standard rack tray.

Great sound, live or in the studio.

Live or in the studio, the TubePre V2 is a great-sounding tool you’ll use on a variety of sources. Add just the right amount of tube distortion to guitars, basses, and mic signals. Go lightly for gentle warmth or go all-out for solid crunch—it’s up to you. So give your ears a treat and test the TubePreV2 at your favorite PreSonus dealer. Then check out the price— and prepare to be amazed. Because with PreSonus, big sound does not have to cost big money.

• 🍎 NOTE: This is a preamplifier, not a power amplifier or phono preamp, can't be used for turntables or passive speakers.
• 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).
• Small compact design, with optimal integrated circuit to get powerful, dynamic and sweet sound. Tubes can be replaced by 6K4,6AK5,EF95, 5654,403B tubes.
• This pre-amp improves everything detail, transparency, immediacy, richness, tone associated with your music.
• Built-in Switch impact protection circuit and overheat protection circuit, long life span of this unit. All aluminum alloy shell and come with a 18-month manufacturer's warranty.

User questions & answers

Question:	Can this preamp connect to my active speakers? or just connnect to power amplifier
Answer:	Hi, This is a stereo preamplifier, you can connect it to the active speakers or power amplifier than to passive speakers.
Question:	I have this hooked up to bookshelf speakers, sounds great, would i hear a noticable difference hooking it to a subwoofer
Answer:	I currently use the Pre-Amp with a powered subwoofer amp, it works just fine. The P1 has frequency response down to 20hz, so adding a subwoofer may be worth your while.
Question:	Can i hook this up to a 2 channel receiver? i have a pioneer sx-10ae
Answer:	Yes you can if your receiver has output/input jacks for the Fosi to be in a "loop". If you do not have input/output jacks then you would be relegated to installing the Fosi to cd player or turntable or whatever component you are trying to acquire a bit of tube sound. I use mine to "soften "a bright metal tweeter in my speakers. Since I have separate components it was easy to install in my case. Also check to see if your receiver has "preamp" in/out jacks. This would also allow you to install the Fosi to have a effect on your receiver as well as any other components you have connected to it. A bit of research on your part will be required.
Question:	Is there a recommended replacement tube
Answer:	I replaced the stock ones with the Riverstone Audio 7-Pin GE JAN 5654W (https://www.amazon.com/gp/product/B01BFJDTW0/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). They are very nice tubes but do need about 20-25 hours of solid burn-in before they start to "warm up the sound" in my opinion.

Product features

6K4 Tube Preamplifier

• Power Adapter Output: 12V/1.5A
• Product Adapter Input Voltage Range: AC 110V - 240V
• SNR ≥ 98dB
• THD ≤ 0.1%
• Treble adjustment range: ±6dB
• Bass adjustment range: ±10dB
• Input Mode: RCA
• Frequency Response: 20HZ -20KHZ((±3dB)

Tube preamp with BASS and TREBLE control

Satisfies your need for more sound quality! Great Warm Smooth Sounding!

Simple, thoughtful design

Fosi Audio P1 is easy to connect to your power amplifier or active(powered) speakers with no software to install or settings to change.

Adopt 2pcs 6K4 vacuum tubes

Powerful, dynamic, and sweet TUBE SOUND! Applicable vacuum tube model:6J1,6AK5,EF95, 5654,403B, etc.

• Multiple audio input methods,It Support Bluetooth 5.0/PC-USB/RCA inputs from various devices like iPod, Phone, MP3, TV, DVD players, laptop, desktop computer or other streaming media players etc.,It's a nice vacuum Headphone tube preamp exclusively designed for the customers who pursue HiFi sound!
• Tube T6 PRO be used as a headphone tube preamplifier,Can Enjoy high-quality lossless music at any time,RCA/3.5mm headphone output(With priority),RCA output to the powered speaker,amplifier & passive speaker,Headphone output is suitable for 16~300Ω headphones and headset
• QCC3008 Bluetooth 5.0,Support APT-X,APT-X LL lossless transmission,Signal transmission faster and stable,let your enjoy the HiFi sound!
• Adopt 6Ж1п-EB tube vacuum design for easy replacement(such as 6J1, 6J2, 6AK5, 6AK5W, 6F31 ,6BA6, 6K4п, GE5654, 6Ж1п,etc)provide warm retro tube sound,With independent gain adjustment design for treble and bass
• All aluminum alloy shell,heavy gold PCB,Build quality is surprisingly solid,Nice touch!With optimal integrated circuit to get dynamic and sweet sound.(Can offer technical support and warranty service!Pls Ask Me:www.amazon.com/hz/help/contact/A3BG62S1F23IH5# .Or leave any of your instant messaging account and I'll contact you.thanks!)

User questions & answers

Question:	Will this work as a usb audio interface
Answer:	This PC-USB only can connect computer, not USB port, also can't use U-disk,pls see the connect of the picture,hope it can help you.thanks
Question:	Will this work as an audio interface and record a mic over usb from the rca input
Answer:	Sorry, this tube preamlifier Headphone output is suitable for 16~300Ω headphones and headsets(With priority) ,it doesn't use for as a an audio interface and record a mic,any other problem,pls contact us by email,will offer technical support

Product features

Use our AIYIMA Tube T6 PRO preamp ,Meet your a variety of application scenarios,enjoy the HiFi music!(This is a Tube Preamplifier,Not a Amplifier)

Product description

Features:

1.All aluminum alloy shell,heavy gold PCB,gold-plated interface.

2.Provide Warmth, Dynamic,Sweet tube coloration feeling.

3.Optimize integrated circuit and high quality power adapter to minimize the noise.

4. Vacuum Tubes detechable and replaceable.

5.With Treble and Bass control function, high playability.

6.Compact Design, space saving.



SOMETHING SHOULD BE KNOW

- It is NOT a phono preamp for turntable. To order a PHONO Preamp, please visit B07QBXV3CG.

- The preamp need to connect with a power amplifier or active speaker, can not connect with a passive speaker directly.

- Low-quality audio lines and power adapter will generate noise as a result.



Specifications:

Power Supply: DC 12V/1.5A

Frequency Response: 20HZ -20KHZ((±3dB)

SNR: 98DB

THD: 0.1%

Control：Potentiometer knob and toggle switch

Treble adjustment range: ±6dB

Bass adjustment range: ±10dB

Audio Inputs/Audio Outputs: Gold-plated RCA

Machine Size: 118.5*98*33mm(4.64 * 3.86 * 1.3 inch)



Package Include:

1 x Tube Preamplifier

2 x 6K4 Tube

1 x Power Adapter



About the Noise:

1. Make sure the RCA cables, the tubes and the adapter are connected well.

2. After that, if there's a noise while useing, please change the adapter(12V/1A or 2A) and try again.

3. If there still a noise, please contact with us via email. We provide 3 month no asked refund and 12 month guarantee, will make a solution to you.

• 🎵NOTICE - This is a preamplifier but NOT a power amplifier or a phono preamp, CAN'T be used for turntables or passive speakers. The main purpose of this machine is to act as a "buffer" to sweet the sound.
• 🎵SWEET TUBE SOUND - Vacuum tube preamp will give you a different acoustic enjoyment with dynamic, sweet tube sound enjoyment. Improve the details, richness, tone associated with your music.
• 🎵TUBES REPLACEABLE - The 3D sound quality of a good tube implementation is simply divine! Tubes detachable design, you can replace the tube to tweaking the sound, 6j1,6j2,6J4,GE5654,6AK5 and 6*1n tubes are suitable for this preamp.
• 🎵 RCA INPUT & OUTPUT - Connect your computer, CD, phone, iPod and other player with RCA cables input and output to the digital amplifiers, active multimedia audio devices for lossless audio(The RCA cables not included).
• 🎵 SAFE DESIGN & AFTER SALE SERVICE: All aluminum alloy shell, compact and durable.Built-in Switch impact protection circuit and overheat protection circuit, long life span of this unit. Provide 12-month manufacturer's warranty, no risk purchase.

User questions & answers

Question:	Can i use this product from a 3.5 mm headphone jack on a tablet to a rca line input on a stereo receiver
Answer:	Yes, you will need to use a cable that has RCA plugs in one end and a headphone plug (1/8") on the other. The headphone plug goes into the tablet and the RCA plugs go into the input of the SUCA-AUDIO. You will use another cable with RCA plugs on both ends. Plug in the RCA plugs on one end into the outputs of the SUCA-AUDIO. The RCA plugs on the other end go into your stereo receiver inputs.
Question:	I'm using philips shp9500 headphones. at a maximum of 32 ohms, could i just combine my headphones with this pre-amplifier without an amp? (pc dac
Answer:	This is a pre-amplifier, not a headphone amplifier. Headphones like the Sennheiser HD6xx could be used because of their high impedance (600 ohms) at a low volume. The 32 ohm Philips headphones may cause issues with this pre-amp.
Question:	I am looking to make the audo louder from my computer to amplifier will this do it? thanks
Answer:	Not really . . . : A preamp (and this is a preamp) only raises the volume of the signal slightly . . . an amp, or amplifier raises it to levels that can power passive speakers. Active speakers have an amp built in. So, you can go from computer to an amp, or from a computer to powered speakers and don't need a preamp. Or, go from the computer to this preamp, then to an amp or powered speakers. You don't NEED a preamp at all if you have an amp, but you can use one if you want to add a volume knob in between the source and speaker, or want to add a tube pre like this for 'color' to alter the qualities of the sound. Sounds like you want an AMP not a preamp otherwise.
Question:	could I use this for a turntable preamp if I had powered speakers
Answer:	No. This preamplifier does not apply RIAA equalization that vinyl playback requires. You will notice that the treble is too loud and bass is severely reduced when you play vinyl.

• ♪ HIGH QUALITY MATERIALS—The chassis of the preamplifier is made of a solid aluminum alloy material, and uses accurate and stable integrated circuits and high-quality components to eliminate low-frequency noise and ensure clear sound quality; The material of its PCB board is made of FR-4 insulation board and black immersion gold Craft, which has the characteristics of stable signal, high temperature resistance, long service life, and not easy to be oxidized.
• ♪ EXQUISITE APPEARANCE DESIGN—FX AUDIO pre-amplifier has a mini exquisite appearance and light weight, easy to carry around, its brushed texture surface and high-quality tube combine to appear more fashionable,elegant and Classical.
• ♪ SEPARATE CONTROL OF BASS&TREBLE—The vacuum tube preamplifier can independently adjust the bass and the specific proportion components in high-frequency sound to perfectly achieve HiFi effects. At the same time it can maximize the rendering of an atmosphere like being in a music performance to satisfy your experience of different sound styles in pursuit sound quality.
• ♪ RCA INPUT & OUTPUT—From RCA output ,the preamp can also be directly connected to the audio source and active multimedia audio equipment or indirectly connected to passive audio through the power amplifier(The item includes RCA cable).
• ♪ NOTE—The item just is a tube preamp, not a power amplifier or phono amplifier. Because it is a household circuit design, the home theater tube preamp can not be used in cars, turntables or passive speakers, nor can it directly work for headphones, speakers and can not be used as a phono amplifier.(Only suitable with 12V power cord).Package Include: 1 x tube preamp, 2 x 5654 tubes,1 x power supply, 1 x RCA cable,1 x user manual, 1 x security card/1 year warranty

Product features

In order to dedicated to serve audiophile and display our cultural concept of "enjoy music,enjoy life", FX AUDIO developed the mini electronic tube preamp.

FX AUDIO tube preamplifier is designed by using aluminum alloy shell, PCB board of black immersion gold craft and gold-plated interface, mainly to enhance the weak voltage signal from the audio source and control the sound quality to achieve the effect of beautifying the sound.

Adopt GE5654 Vacuum Tube Design

The audio preamplifier is designed with two GE5654 vacuum tube, which can simulate natural sound,that is soft and delicate, dynamic and pleasing, strong and powerful, and very penetrating. FX AUDIO Pre-amplifier is the best choice for the friends who have high pursue with the sound timbre. (The tube can also be replaced according to personal preference).

HiFi Sound Quality

The function of the audio quality control of the audio preamplifier is to control the frequency characteristics of the audio system to achieve high-fidelity sound quality, or to modify and beautify the sound according to the listener's preferences, but also to adjust the sound range to achieve balance Make the resolution of sound more natural and transparent.

Wide Compatibility

FX AUDIO tube preamplifier have a wide compatibility,which input can be connected to various audio source equipment, including mobile phones, computers, CD / DVD, etc. From RCA output ,the preamp can be connected the power amplifiers to use ,also can be connected directly to an active speaker.