10 best 12ax7 phono preamps

Product description

Technical Specifications:

• Output Voltage: 2.0V
• Gain = 48dB
• Input RIAA ≤ 5mV
• THD ≤ 0.5%
• Frequency Response: standard characters
• Signal to Noise Ratio ≥ 65dB(A)1KHz (input: 10mV; output: 0.7V)
• Power supply: AC110V(115V) 60Hz/50Hz

Packages:

• 1 × Preamplifier
• 1 × 6Z4 Tube
• 3 × 6N2 Tubes
• 3 × Metal Tube Covers
• 4 × Acrylic Tube Covers
• 1 × Power Cable
• 1 × GND wire

Q&A:

Q: I got a loud hum with T11.

A: At first, we have to clarify that all phono preamps have a certain of background noise. It won't be loud, while a little loud is normal. Besides, there are many factors.

• Reason A: T11 isn't connected to ground well.

  While the device is playing music, picking up the GND copper part of T11 with your fingers. If the background noise is much lower, then T11 isn’t connected to the ground. For this issue, we prepared a 3m wire in the package for you to solve it by yourself. Just use it to connect the GND with any large mental item in your home like windows or mental tables.

• Reason B: T11 doesn’t match with your amplifier well.

  Digital amplifiers cannot be connected to the ground directly, which may cause T11 much noise. For this issue, you can just set the T11 GND switch (on the back of it) to OFF. However, this will lead to bad noise from T11 itself as it is not connected to the ground. You can only choose the bearable way. That’s why we recommend using professional pure HiFi amplifiers (no Bluetooth will be better).

• Reason C: The RCA wire has a poor quality.

  A good RCA wire will be equipped with an anti-jamming magnetic ring, which can effectively reduce various interference.

• Little Bear T11 is a pure tube phono preamplifier working with MM cartridge turntables only. Please make sure your turntable is equipped with a PHONO signal output instead of a LINE output.
• Little Bear T11 is based on T10 with improvement. Compared to T10, T11 has lower background noise at normal volume. Its sound performance is better with increased liveness.
• Adopting a conventional active RIAA equalization phono stage circuit. There is 3 metal covers and 4 acrylic covers for those tubes. And you will be able to choose which type as you like.
• Supporting 6N2/12AX7 tubes, which offers many replaceable tubes for you like 6H2,6H2n (For 6N2 type) and 12AX7B,6N4(9PIN),ECC83,5751 (For 12AX7 type).
• On the bottom of the description, there is a few Q&A for buyers who might meet the humming problem. If you encounter a similar issue, please check those tips, which have covered most of conditions.

User questions & answers

Question:	What do I have s on much noise beyond regular record noise
Answer:	Yes, I think these wall mount shelves are not only used for dispalying vinyl records, but also they are perfect for displaying dvds and blu-rays. This item is 15 inches long, I suggest you buy our 7 inches long wall mount shelf to display your dvds and blu-rays. You can search B0885VKFGY on Amazon to get it. Thanks.
Question:	The ground terminal does not accept the standard U-shaped connector on my turntable's ground wire. How do I ground w/o modding turntable
Answer:	Hi, we can ship replacement screws to you for free. Please email us by [email protected]. Our customer service team will make things right for you.
Question:	When it says having a anti-jamming magnetic ring wire helps with interference; does that mean from the turn table to the t11 or from the t11 2 the amp
Answer:	The album wall shelves comes with 6 pieces in one package, each shelf is 12 inch long, 1 3/8 inch deep, you can display 2-3 albums one behind one. Hope this helps.
Question:	Can this be used as a pre-amp? Hooked directly to my Adcom amp? Do i need to run this into a regular pre-amp...is that a real volume knob or a gain
Answer:	I have installed. I see almost no way for single ir doubke lp to fall from properly installed.

Product description

Technical Parameters:

Input sensitivity: 400mv

Voltage output: 2V (RMS THD <0.03%)

S / N Ratio: 94DB

Frequency Response: 12Hz-50KHz (-0.5DB)

Input Impedance: 200Kohm

Output Impedance: 600ohm

AC Input: 100V (115V)

Power Consumption: 30W

Dimension (W-D-H): 320 * 170 * 120 mm / 12.6 * 6.69 * 4.72 in (Add tube height)

Net Weight: 3.5 kg / 7.72 lb, with a packaging weight 4 kg / 8.82 lb



Package Includes:

1× tube preamp

1× Power cord

• Improved circuit; Vacuum Tube: Shuguang 12AX7 * 2 / 12AU7 * 2 / 6Z4 * 2
• Excellent scaffolding design, reasonable, regular, symmetrical device layout, strictly respect the grounding line
• Power Transformers 76 * 40 H250 0.35 sheets; Japan ALPS 16 A-type audio potentiometer
• Full aluminum chassis with wood side panel; 4 Set of stereo L/R RCA auido input, 1 set of RCA output

User questions & answers

Question:	How easy is it to replace the tube sockets in this unit? Some were screwed up on receipt and I may have damaged others replacing tubes
Answer:	Solid state, uses discrete components. Very neutral sounding and has a very open soundstage.
Question:	How many dB of gain can it add to the input signal
Answer:	I've no idea. I gave it away. It wasn't what I needed. It did work fine, but it didn't have a actual On/Off switch which was a bother.
Question:	ax7 tubes are noted for a treble shrillness. is this noticeable on this unit? can the 12ax7 tubes be rolled to lower-gain 12at7 tubes
Answer:	Yes, the RCA out on your tape deck will connect directly into the PA550 and the adjustable treble will give it more boost.
Question:	Can you tell me what size is the pot shaft for the knobs on the front - if I wanted to order nee knobs. This would be the size opening on the backsid
Answer:	Yes, plug your turntable into the PA550 phono input. Plug the output of the PA550 into the input of the SE560 then use the output of the SE560 to go to your amp or preamp. Works perfectly. When first set up, set the level controls of both units half way up.

Product description

It vividly and naturally recreates recordings and has a uncanny ability to compliment any turntable. The Bellari VP130 further defines its position as the price-to-performance world-beater, do-everything-well, high fidelity phono preamplifier. You need vacuum tubes in your life, and the 12AX7 tube in the VP130 is the perfect audio upgrade to your system. “The versatile Bellari looks great and it sounded as good as it looks. It was quiet and golden-sweet and liquid in the midrange, as you’d expect from a 12AX7-based phono preamp. I wasn’t expecting its top end to be so nicely extended, fast, and clean, or its bass to be so snappy, articulate, and extended. Every type of music I played through the surprising little Bellari sounded full-bodied and rich, yet detailed and crisply rendered. The Bellari gets my highest recommendation, and is the budget phono preamp I will now recommend for every genre of music…get a Bellari and a budget turntable, and I promise that your CDs will start to gather dust!” – Michael Fremer, Stereophile “The Bargain of a Lifetime Tube Phono Stage. For (this price), the Bellari Tube Phonostage offers warm musical sound and may be just what the doctor ordered for those who want to get into analog without loading up the credit card.” – The Absolute Sound “I was surprised by how attractive and well balanced it sounded: smooth and warm, yet open and crisply detailed. The Bellari seemed to create a sound that was rich, natural and appealing. Surface noise was low, and the music emerged from a crisp, clean, quiet background. It was an excellent sound by almost any standards; one I was very happy to listen to. An excellent performer at a very reasonable price!” – Jimmy Hughes, HiFi Specifications Cartridge Compatibility: Moving Magnet or High output Moving Coil Gain: 38.9 dB gain @ 1kHz with 12AX7 Tube Input Impedance: 47k ohms Output Impedance: 8-200 ohms Headphone, 100 ohms RCA Equalization: RIAA +/- .9 dB, 20Hz to 20kHz THD .05% @ 1KHz S/N Ratio:

• It vividly and naturally recreates recordings and has a uncanny ability to compliment any turntable. The Bellari VP130 further defines its position as the price-to-performance world-beater, do-everything-well, high fidelity phono preamplifier. You need vacuum tubes in your life, and the 12AX7 tube in the VP130 is the perfect audio upgrade to your system.
• “The Bargain of a Lifetime Tube Phono Stage. For (this price), the Bellari Tube Phonostage offers warm musical sound and may be just what the doctor ordered for those who want to get into analog without loading up the credit card.” – The Absolute Sound
• “I was surprised by how attractive and well balanced it sounded: smooth and warm, yet open and crisply detailed. The Bellari seemed to create a sound that was rich, natural and appealing. Surface noise was low, and the music emerged from a crisp, clean, quiet background. It was an excellent sound by almost any standards; one I was very happy to listen to. An excellent performer at a very reasonable price!” – Jimmy Hughes, HiFi
• Cartridge Compatibility: Moving Magnet or High output Moving Coil Gain: 38.9 dB gain @ 1kHz with 12AX7 Tube Input Impedance: 47k ohms Output Impedance: 8-200 ohms Headphone, 100 ohms RCA
• Equalization: RIAA +/- .9 dB, 20Hz to 20kHz THD .05% @ 1KHz S/N Ratio: 103 dB, unweighted Crosstalk: -75 dB Size: 6″w x 2.5″h x 5.4″d

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"

• 🍎 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.

• ❤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

Hi-Fi - Never before has a preamp tube better reflected the Genelex Gold Lion ideals of perfection. Combining the purest raw materials, this Genelex Gold Lion B759 / ECC83 / 12AX7 tube has been designed with dual oversized plates, noise canceling spiral wound filaments, thick structural mica spacers, and gold plated contact pins. These features provide solid low end response coupled with an articulate midrange and delicately warm high end tonality. Especially useful for taming brittle digital sources such as MP3, CD and DVD players, the Genelex Gold Lion B759 tube is the premier choice for the best audiophile experience. Guitar - Woe to other preamp tubes because this Genelex Gold Lion B759 tube is THE power house of tone. With solid lows deeper than the Marianas trench and mids that butter the air, this tube easily vanquishes all pretenders with its over-the-top tonality. The dual oversized plates, noise canceling spiral wound filaments, thick structural mica spacers, and gold plated contact pins give this Genelex Gold Lion B749 better clarity, warmth, and sheer muscle than any other mere 12AX7. If you've been looking, here it is. The Genelex Gold Lion B759 tube will take you and your tone to a higher level of performance. Compare with other tubes here.

• High gain preamp tube
• Best current production 12AX7
• Great tone and low noise

User questions & answers

Question:	Are these the premium gold pin version
Answer:	Thanks for your inquiry. If the unit was purchased in North America, you may have luck contacting the distributor, The Lenbrook Group, at (905) 831-6555 to inquire about parts. Please let us know if you have any other questions!
Question:	I have a set of pre/amp unison research c5pline/p30k.i would like to know the price of the set of 12ax7/ecc83(5pcs) & kt88matched(4pcs
Answer:	When the warranty ends I will pop it open for the manufacturer but it is 16 bit /48khz.
Question:	Is this item single or pair
Answer:	Yes you can connect it . Once you have the nad pp4 you don't have to connect it to the phono of your equipment just in any jacket.
Question:	Hi does anyone know how these tubes compare to the German made telefunken tubes? Thanks
Answer:	Just as CD's are different from records your recordings won't have exactly the same signature as pure analogue. They will be close, however. The USB (digital) output of the PP4 is 16 bit/48kHz, slightly above CD quality. With a decent DAC for playback, your files will sound far superior to compressed digital formats and quite sonically rewarding.Dick from Spearit Sound

Product description

The ZEN Phono is a one of a kind phono stage. Using trickle down technology from AMR/iFi phono pre-amps, we have created features, performance and eye pleasing aesthetics that bring a new, refreshing feel and sound to any room. The noise floor is a whisper-quiet –90/96dB (36/60dB, BAL 2V/SE 1V, A-weighted) on MM/MC respectively. It can handle moving magnet and moving coil cartridges from <0.25mV to >2mV and brings true high-end performance and flexibility to the novice vinyl collector. A custom-made Intelligent Sub-sonic filter can distinguish between a warp in the vinyl record and a true bass note, letting low and mid range frequencies pass through untouched. Together these features deliver a hassle-free listening experience free of unwanted noise or complicated setup.

• INPUTS - Selectable MM and MC cartridge input
• OUTPUTS - RCA and Balanced 4.4mm Pentacon Outputs
• CUSTOMIZE TO YOUR TURNTABLE SETUP - Ultrawide 36dB to 72dB gain
• INTELLIGENT - subsonic analog filter
• ACCESSORIES - Includes 5V DC power supply and RCA cable

User questions & answers

Question:	Would adding one of these to a headphone amp + turntable setup reduce popping/crackling when listening with headphones
Answer:	No, this does nothing to clean up the sound of the record due to pops and clicks. I would recommend an ultrasonic cleaner for that. You can buy ready made kits, or you can create a DIY kit at home.
Question:	Does this get power from a standard home outlet
Answer:	Yes. It comes with a 5 volt power supply that plugs directly into a standard wall outlet.

• 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

Product description

Since many modern amplifiers no longer have a dedicated phono input, the phono box mm from Pro-Ject is the perfect addition to your turntable setup. Compatible with nearly any moving magnet cartridge, the phono box mm gives you a superb audiophile music experience at an entry-level price. The utilization of advanced circuitry keeps noise and distortion extremely low, and the metallic case and outboard DC power supply keeps the unit free from electromagnetic interference. Since it's only slightly larger than a pack of playing cards, the phono box mm can be placed nearly anywhere. The RCA input and output sockets are gold-plated to preserve sound quality and can be connected directly to any line-level input (aux, CD, Etc.) on your amplifier.

• Compatible with moving Magnet phono cartridges
• Dual-mono circuitry for optimized Channel separation
• Low-noise integrated circuits
• Gold-plated RCA inputs and outputs
• Metal case protects unit from vibrations and electromagnetic interference

User questions & answers

Question:	Can i play vinyl from my B&O 3400 turntable & cartridge thru a vizio soundbar model# s4251w-b4? Do I need to use my pyramid sea2500x preamp too
Answer:	Most likely. I go from my record player to this to a mixer. So I'm guessing your receiver probably has an aux in which is what you plug into from the art.
Question:	Do i need to buy this for yamaha A-s801 integrated amp or that amp has a phono
Answer:	Sansui? Ceramic's, as I recall, can run close to 1 V output. This preamp is designed for moving magnet cartridges (not moving coil) that produce ~ 5 mV output. Even at -10 dB on the gain/attenuation knob, it would still be too hot. 1 V with -10 dB attenuation is ~ 300 mV which is far more than supported. Per manufacturer, max input is 40 mV. So, no, this won't work with your ceramic cartridge.
Question:	Just to be clear, my AVR (Onkyo tx-nr535) doesn't have a phono input. Do I connect the turntable to this device and plug this device into my AUX port
Answer:	Without a ground wire, there may be a discernible hum. I have a Yamaha PF 1000 and the ground wire is is a must.
Question:	How can i tell if my pioneer pl-460 is mm or mc
Answer:	I've had both, and kept the DJpre. There's a thread on an audio science forum where a user conducted a thorough level-matched test of both the Pluto and the DJpre with an oscilloscope and other precision instruments. They both performed very well, but the DJpre came out decidedly on top in several key categories. Whether that translates to a noticeable difference in sound quality depends on the listener, but the DJpre is empirically better than the already good Pluto. He also found that the DJpre performed best when the low cut rumble filter was on--not only did it kill the sub-20hz sounds, it actually boosted the audible frequency response across the board (particularly the highs where the Pluto tends to roll off). This is easily the best phono pre at $50 and under, and performs better than units costing twice as much. You'd have to spend $250+ to get a better pre, and even then it'll only be a miniscule improvement.

Product features

Features

• Amplification and RIAA equalisation for MM and High-Output MC cartridges
• Metal case shields the electronics from vibrational and electromagnetic interference
• Special low-noise ICs used
• Optimal channel separation through dual-mono circuitry
• Gold plated RCA connection sockets
• DC power supply (< 1 watt standby power)
• Small size allows installation close to record player

Audiostance reviews the Phono Box MM

US, 05.2019 "If your budget is maxed at 100 then the Pro-Ject Phono Box MM is the best phono preamp under 100. Pro-Ject Audio is a high-end turntable and phono accessories manufacturer out of Austria in Europe."