13 best bravo tube amplifier

Product description

Enjoy the pure, non-fatiguing sound of Class A amplification with the Bravo V2 headphone amplifier.

• Includes high-quality Shuguang 12AU7 tube
• Parallel 3.5mm and RCA stereo inputs
• Gain control with Japanese ALPS potentiometer

User questions & answers

Question:	Does this boost sound enough to use as the only amp to listen to records with headphones
Answer:	Short answer: no. Long answer: this amplifier expects about 1 Volt input for a full power output. A phonograph player only generates output in the .005 Volt sort of range. Also, the signal from a phonograph has to go through an RIAA filter to recover the low-frequency information. A record would not be able to wiggle a needle correctly to generate bass, and so RIAA equalization is applied during record pressing.
Question:	I mostly listen to music in digital format (MP3) and trying to decide between this amp and a USB headphone DAC...thoughts
Answer:	You're comparing Apples and Oranges. The Bravo is strictly a headphone amp. I use my Bravo with a Behringer UCA222. I chose the Behringer because it's a DAC (digital to analog converter) and an ADC (analog to digital converter). I use the Behringer to "rip" vinyl to FLAC files. Why bother with sonically compromised MP3 files when storage space is so cheap?
Question:	I don't know much about tube circuits. Do both headphone channels go through the tube at once and remain seperate channels? Or are they combined
Answer:	The answers about being two separate channels in the tube are correct. But there is an issue in the amp that needs a simple modification. Because of the way it was designed, there is an issue with balance and separation of channels. If you balance to one side or the other, there is still sound out of both left and right speakers or headphones. See the first post on this forum, just scroll down to the picture entitled 'Crosstalk improvement', which is the 6th picture, for details: http://rockgrotto.proboards.com/thread/5297/bravo-12au7-mods-appreciation-thread And be sure to get some different old stock tubes on "The Bay" from the 50's and or 60's. The RCA Clear Top is my favorite so far.
Question:	Stupid questiion of the year. How do you use this and what do you use it for
Answer:	Another more pedestrian use is if you have high quality, high impedance headphones and want to listen to a consumer-grade device (e.g. iPod). Standard headphones are around 32Ω impedance, while higher-end ones can be anywhere from 80Ω to north of 600Ω. The device will still drive the headphones, but the sound may be quiet or sound muffled. A headphone amp does what it says on the box, and amplifies the output -- which results in louder and clearer sound on high-impedance headphones.

• 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

• NS-08E is a Hi-Fi tube headphone amp. It can offer >=1100mW at 32Ω and can drive 18~600 ohm headphones & headsets.
• New version adopts 6J3 vacuum & valve tube, which has warmer tube sound and more replaceable tubes.
• Upgrade circuit can ensure lower background noise, more powerful bass and more brilliant treble.
• It can also be used as a stereo preamplifier for other amplifiers and active speakers. For better preamp function, we recommend NS-10P (ASIN: B07719G56B).
• CNC Aluminum shell with super mini size. Very solid workmanship. Prompt and courteous customer service.18-month warranty and life technical support. For any questions, please contact us on Amazon.

User questions & answers

Question:	What is the difference between a tube amp and a dac/amp combo
Answer:	Not from my knowledge no. There's just an input on the back of the cab. With other cabs it may be possible though.
Question:	Can the line/headphone out be connected to powered speaker
Answer:	Mine did *not* come with a speaker cable. Please note that an 'instrument' cable is needed rather than a regular guitar cable.
Question:	Would this work for the audio-technica ath-m50x headphones
Answer:	It comes w/ jumper cable from head to speaker. Then you’ll need a guitar cable to go from instrument to head unit. I would recommend you buy head unit separate and get a larger speaker than the 8”. It’s loud but doesn’t sound as good as a 10 or 12
Question:	Is this a true 100% tube driven amp? Most Nobsound amps use tubes for pre-amp and use transistor amplification, rendering the tubes useless
Answer:	The head yes but the cab no. It gets really loud but sounds pretty bad through 8” speaker. Buy the head separate and get a 12” cab

Product features

Powerful Drive & High Sound Quality

• NS-08E is a Hi-Fi tube headphone amp. It can offer >=1100mW at 32Ω and can drive 18~600 ohm headphones & headsets.
• Upgrade circuit can ensure lower background noise, more powerful bass and more brilliant treble.
• It can also be used as a stereo preamplifier for other amplifiers and active speakers. For better preamp function, we recommend NS-10P (ASIN: B07719G56B).

6J3 Vacuum & Valve Tube

• New version adopts 6J3 vacuum & valve tube, which has warmer tube sound and more replaceable tubes.
• Full List of Replacement Tubes: 6J1, 6ж1П, 6AK5, 6BC5, 403A/B, 5654, EF40, EF95, CV850, 6J2, 6ж2П, 6AS6, CV2522, EF11/732, CV4011, 6J3, 6ж3П, EF96, CV848, 6BC6, 6AG5, 6J4, 6ж4, 6136, 6BX6, 6AC7, EF94, 6AU6, 6J5, 6ж5П, EF80, CV2521, 6F36, 6AH6, 6AN5, 6K4, 6K5, 6K4П, 6BA6, 6DA6, EF89/93, 5749

Mini Size & Solid Shell

• CNC Aluminum shell with super mini size. Very solid workmanship.

Product Details

• Output power: ≥1100 mW (32 ohm)
• Headphone Adapter Impedance: 18-600 ohm
• Total harmonic distortion: <0.005%
• SNR: ≥110 dB
• Frequency Response: 20 Hz - 30 kHz
• Size: 111*69*32 mm / 4.37*2.72*1.26 in (Height: 73 mm with vacuum tube installed)
• Net Weight: 185 g / 0.41 lb
• Power supply: Input voltage: AC 100-240V 50/60 Hz; Output voltage: DC 6V 2000Ma

Notice:

• Please turn on the amplifier for about 15 seconds before you connect the audio source and put on the headset.
• We recommend using 24~600Ω headphones, while armature earphones and headphones that have low resistance and high sensitivity are not suitable.
• As there will be tube Microphone effect, please keep the amplifier steady while using it.
• For noise issue, please keep it away from devices like routers, mobile phones or something that may interfere in the audio signal.
• If there are no interference, please remove all input and listen to see if the noise still exists.

• This Class A single-ended vacuum tube amplifier adopts hand welding to ensure the true reality of the sound quality (with headphone amp function ASIN: B076CC92BX).
• This amplifier adopts transformer parallel output to reduce its internal resistance by half and achieve doubled improvement on its power.
• Using antimagnetic transformer covers to shield current interference and achieve much lower static noise.
• Its sound output is full of analog style. The bass part is deep and powerful and the vocal part is sweet and intoxicating.
• It has a classic and graceful appearance. The VU meters and vacuum tubes makes it more elegant and attractive.

User questions & answers

Question:	input sensitivity
Answer:	How loud it will get greatly depends on your speaker sensitivity. If you are using very efficient speakers it will fill a medium size room with sound. My speakers have a sensitivity of 99 db and it will fill the medium size living and dining room with plenty enough sound for my liking. If you are talking about a large gathering of people in a large area I am not sure this amplifier will fit your needs.
Question:	Can the VU meters sensitivity be adjusted to deflect (jump) more for aesthetic reasons
Answer:	Is this the one with point to point wiring and the tube cage?---------YES. point to point wiring and come with the tube cage.
Question:	w? Seems light. Is that enough to power a large speaker or is this amp for powered speakers only
Answer:	Most turntables will need an additional pre-amplifier to boost their signal before plugging them into the Reisong A10. However, if you happen to own the Audio Technica AT-LP60, which contains it's own inboard phono pre-amplifier, you won't need a separate phono pre-amp.
Question:	How loud can it get? Is it adequate for just bedroom listening or can it be used for a party
Answer:	Can i replace 6n2j tubes with 12ax7/ecc83 tubes? ----YES. But you please pay attention to adjusting the electronic pin position when you replace them.

Product features

Parameters

• Output power: 6.8W * 2
• Frequency response: 20Hz-20KHz
• Input impedance: 100K ohms
• Output impedance: 4/8Ω
• SNR: 90db
• Input Sensitivity: 500mv-2000mv
• Harmonic distortion: 1% (1KHz)
• Tube: 5U4C * 1 + 6H8C * 2 + 6P1 * 4
• Operating voltage: 110V

Retro Classic Vacuum Tube

• 5U4C * 1 + 6H8C * 2 + 6P1 * 4
• Vacuum tubes can offer warm retro analog sound unlike normal digital sound.

Hand Welding & Better Sound Quality

• Totally hand welding can decrease sound losses and ensure better sound quality.
• Its transformers adopt parallel output design, which achieve only half resistance. It has doubled power and still keeps the features of>

Luxury Components & Multiple-Paint Transformer Shield

• This amp adopts 150µV 450V Hi-Fi level BC Components high voltage capacitors.
• Multiple-paint transformer shield can avoid current interference, which can get lower background noise.
• Sound quality is more natural and warmer.

Gold-Plated Pure Copper Terminals

• Adopts gold-plated pure copper terminals.
• Speaker out binding posts can accept banana plugs and bare speaker wires.
• Both 4Ω and 8Ω speakers can connect to the 8Ω and 0Ω posts of this amplifier.

• Military grade 6N3 electronic tubes and carefully tuned circuits.Powerful drive circuit up to 600mW at 64Ω .
• Fully balanced headphone amplifier,including balanced input interface.
• Hi-End volume control NJW1195 produced by JRC Japan.
• Use relay for mute control.Humanized operation with memory function.
• Aluminum CNC,very fine workmanship.

User questions & answers

Question:	What is the voltage and amperage of the included power supply
Answer:	12 volts DC @ 1.67 amps.
Question:	I have a dragonfly red, would this amp be a good match? also have xlr balanced sennheiser hd600 cable out
Answer:	I don't have the dragonfly red, which has the ESS 9016 DAC chip but feed mine with the SMSL SU8 which has the ESS ES9038Q2M DAC and it pairs very nicely with it. My guess is that it would be slightly warmer and less clinical than the built in headphone amp chip on the dragonfly red, but I'm only guessing. The SU8 and the Loxjie sound very nice with Tidal and Qobuz although you may have an edge with the dragonfly red with Tidal since it has MQA decoding which the SU8 does not. I have the HD 6xx's and the HD 58x running balanced and they both pair very nicely with the Loxjie. I imagine the HD600's will pair well too.
Question:	Could this amp power 300 ohm headphones
Answer:	Yes,P20 can power 300 ohm headphone.
Question:	Is it safe to use a higher quality 12v rated power supply, but rated at 3 amps instead of the stock
Answer:	While someone more knowledgeable has answered the question already, I would like to correct one thing they said... The LOXJIE P20 does indeed have a on/off button... press the volume knob in for 3 seconds to power off the amp.

• Home Hi-Fi integrated amplifier, 50W RMSx2 (4 ohms, 20 Hz - 20 kHz, 0.04% THD), Adopt High-quality TPA3116D2 chip, exclusively designed for the customers who pursue HiFi sound
• Bluetooth Receiver, range: about 40 ft-- Adopt CSR64215 Bluetooth 4.2 core Supports the aptX Low Latency codec to virtually eliminate audio-visual lag making an ideal choice for watching TV/ movies. For best results, use with aptX Low Latency supporting speakers
• Adopt 2pcs 6J4 tubes, It could make sound soft, thick, sweet and transparent, tubes can be replaced by 6K4, 6J1, GE5654, 6AK5, 6ж1П, 6BC5, 403A/B, EF40, EF95 and so on
• Advanced circuitry design, built-in speakers protection circuit, solid aluminum chassis for long time use, small size, good looks, simple functionality, and excellent sound quality
• 【Power amp + Headphone amp】 Power amplifier is easy to connect to your audio system with no software to install or settings to change. Headphone amp supports most headphones of high impedance 16-300Ω, Perfectly suited for your High impedance headphone

User questions & answers

Question:	Can the power supply take 220v? i ordered the unit from amazon us but we use 220v here. does the power supply detect the voltage
Answer:	Not sure, I believe it depends on your outlet. 110-220v three prong standard outlet.
Question:	Hi I can't get no sound out of mines I put them on 40 watt speakers speakers work fine I even tried 20 watt speakers anybody else have that problem
Answer:	Make sure your speakers are 4-8 Ohms. These are 50 watts 4 Ohms and 30 watts 8 Ohms per speaker.
Question:	Is it good for movie watching
Answer:	I would recommend buying an actual home theater amplifier for watching movies, but if you are using this little amplifier for desktop monitors then it is perfect for movies
Question:	does this have a built in DAC
Answer:	This model doesn't built in DAC. If you want a Stereo Audio Amplifier built in DAC, you could check this one as following: https://www.amazon.com/dp/B07XLLLSFS Hope it help.

Product features

2 Channel Mini Hi-Fi Class D Integrated Amp for Home Passive Speakers 50W + 50W

Home Hi-Fi integrated amplifier, 50W RMSx2 (4 ohms, 20 Hz - 20 kHz, 0.04% THD), Adopt High-quality TPA3116D2 chip, exclusively designed for the customers who pursue HiFi sound

Bluetooth Receiver, range: about 40 ft-- Adopt CSR64215 Bluetooth 4.2 core Supports the aptX Low Latency codec to virtually eliminate audio-visual lag making an ideal choice for watching TV/ movies. For best results, use with aptX Low Latency supporting speakers

Adopt 2pcs 6J4 tubes, It could make sound soft, thick, sweet and transparent, tubes can be replaced by 6K4, 6J1, GE5654, 6AK5, 6ж1П, 6BC5, 403A/B, EF40, EF95 and so on

Advanced circuitry design, built-in speakers protection circuit, solid aluminum chassis for long time use, small size, good looks, simple functionality, and excellent sound quality

Power amp + Headphone amp

Power amplifier is easy to connect to your audio system with no software to install or settings to change. Headphone amp supports most headphones of high impedance 16-300Ω, Perfectly suited for your High impedance headphone

Package Content:

1 x Bluetooth Audio Amplifier

2 x 6J4 tube

8 x Speaker Banana Plugs

1 x 24V/4A Power supply

1 x AC power cord

1 x User's Manual

• 12AU7 vacuum tube MOSFET Class A amplifier without any OP amp or IC; Pure warm and sweet tube sound
• Unlike acrylic shell, PCB shell is more expensive and solid and has fine anti-interference and shielding
• Input: 3.5mm (phone/MP3/palyer) & RCA (CD player/computer); Output: 3.5mm&6.5mm headphone port & RCA
• RCA LINE OUT: Can be used as a preamaplifier for other amplifiers or active speakers
• 12AU7 vacuum tube: can be replaced by 12 series and 6 series tubes (with a switch to select)

User questions & answers

Question:	Can I connect this to a denon receiver to get the tube sound
Answer:	While I cannot speak specifically to your situation with a Denon receiver, I can tell you that I I'm happily using the Little Bear as a stage between my turntable preamp and amplified speakers to add the warmth of a tube stage.
Question:	Can this also be used for a pre amp for phonograph
Answer:	Hi, I haven't tried it but usually you need a different type of amp to amplify the signal since the phonographs voltage is so low. I bought this one and it works well with mine. https://www.amazon.com/gp/product/B00025742A/ref=oh_aui_search_asin_title?ie=UTF8&psc=1 . Hope that helps. You would need both amps if you want to use your headphones with your phonograph. Good luck!

Product features

Nobsound Little Bear P10

Front

Back

Inside 1

Inside 2

• Tube A5 is a Bluetooth vacuum tube pre-amplifier and headphone amplifier,Adopt the Dual run amplifier chip NE5532 power conversion module.Adopt TPA3116D2 Amplifier chip,Bluetooth 4.2 Support APTX low latency
• The tube headphone amplifier Adopt classical tube 6j4 design and optimize the route, can provide warm retro soft sound,tubes can be replaced by 6K4, 6J1, GE5654, 6AK5, 6ж1П, 6BC5, 403A/B, EF40, EF95 etc,. to enjoy HiFi sound of different styles
• 3.5mm headphone jack output for 16-64ohm headphones,Power Amplifier Output Power 50W+50W, best for outdoor/ bookshelf/ computer/ desktop /ceiling /floor standing speakers, can use iPod, Phone, MP3 players, TV, Echo Dot, CD players, or Streaming Media players as input
• With DC 19V Power Supply,treble & bass control can achieve different sound styles,With Remote control makes the operation more convenient, very suitable for home and desktop audio systems
• Reasonable circuit layout,Exquisite and unique appearance design,aluminum case solid touch,perfectly suited for your desktop or a other space in your home or office;Under normal circumstances, distortion is caused by the mismatch between the power of the amplifier and the speaker. Therefore, it can be reasonably matched according to the ratio of 1.2-1.5 to 1 between the power amplifier and the speaker

User questions & answers

Question:	Does this amp (or pre-amp) support active (or passive) speakers? the product description differs from the diagram
Answer:	You can directly connect bookshelf speakers into it. Unfortunately, I had to return my unit because sound was coming out distorted, so I was not able to learn more about this product.
Question:	Does amp come with dedicated power supply
Answer:	Yes, small power plug 110 volts
Question:	Can i stream via bluetooth spotify from my ipad to this preamp and listen to music with my headphones?? thanks for your help
Answer:	if you device with the bluetooth moudle signal transmission,then it can connect our tube a5.But If you ipad with bluetooth moudle,you can use it match connect our tube amplifier directly as the audio input,then connect your headphone,any other technical support,pls contact us.
Question:	Is there a version that works with a passive or powered subwoofer? Suggestions
Answer:	it can work with passive speaker,pls see our product description,thanks

Product features

Using classical Vacuum tube 6j4 design

Tubes can be replaced by 6J1, 6K4, GE5654, 6AK5, 6ж1П, 6BC5, 403A, EF40, EF95 and so on；

Both the appearance and the build quality are very powerful；

Tube A5 is very suitable for your home audio amplifier system

Headset /RCA Audio Output

This is Vacuum Tube amplifier;Cannot be used for record player;

Bluetooth & RCA Audio input selectable;

3.5mm headphone Output for 16-64ohm headphones/RCA Audio Output;

It is best for outdoor/ bookshelf/ computer/ desktop /ceiling /floor passive speakers

Bluetooth 4.2 Amplifier

Support apt-X and apt-X low latency；

Adopt TPA3116D2 Amplifier chip,Bluetooth 4.2 CSR64215 chip and HT97220 Chip；

Applicable to most Bluetooth devices:such as iPod, Phone, MP3 players, TV, Echo Dot etc.

• Notice: ① Preamplifier needs to work with amplifiers or active devices; ② Not PHONO preamp and can't be used for record players
• Excellent sound performance; No background noise; Warm and soft tube sound; Sound quality enhancement; Pure tube preamplifier; Suitable for all amplifiers and music types
• With independent treble, bass and volume control; Vacuum tubes can be replaced by various models
• Mini size and exquisite appearance; CNC aluminum shell and front panel; Blue tube light; Mellow and solid touch feeling

User questions & answers

Question:	I connect my pc to amplifier - the audio output of pc is weak - could it boost it (aoudio aut of pc)much more
Answer:	I don’t have a meter, so I can’t tell you that. However this amp was a vast improvement from the starter Vox amp that I had before. I’m sure if I spent more to buy a set of stacks that would be even better. It never ends.
Question:	Will this improve sound to the AUX port in car stereos
Answer:	There is a slight hiss in these amps, I own the guitar and bass. It's very minimal and does not seem to hiss when its playing, it has to do with the nutube neon light tubes in the amp, it's really cool stuff if you look into it and really creates great tube tone, but hussy when it's just sitting, if you invest in a noise gate pedal, I'd it would help quite a bit
Question:	Does the bass function really work
Answer:	It is not waterproof,, I do have it installed in my 185 searay,,, under my dash and tucked away clear from water,,,, it sounds amazing!! But it is not waterproof....
Question:	What kind of rca cable would i use for the “in” since both ends only have one jack
Answer:	It comes with every thing you need

Product features

Nobsound NS-10P Mini Vacuum Tube Preamp HiFi Audio Pre-Amplifier Tone Control

Parameters:

• Power supply: Input -- AC 100~240V; 50/60Hz (universal) & Output -- DC 6V 2000Ma
• Voltage amplification: 1.5 ~ 2.0 times
• Audio input / output: standard 3.5mm
• Power interface: 6V -- 5.5 * 2.5
• SNR: ≥ 110dB
• Frequency response: 20Hz ~ 30 KHz
• Dimensions: 105 * 69 * 32 (65mm height with tubes)
• Net weight: 205g

Packing List:

• 1 * NS-10P tube preamp
• 2 * 6J1 tubes
• 1 * 6V / 2000mA power supply

Using Instructions:

• Phone / Player / MP3 / CD / DAC / Computer Audio source→ 3.5mm / RCA audio cable → NS-10P preamp → 3.5mm / RCA audio cable → Amplifier / Headphone amplifier / Active speakers

Product description

Yustda Platinum Quality Features:



* Overload Protection with High Quality Wires

* Over-charge/discharge protection

* Overheating Protection with Smart Chip

* Anti-Interference Feature with better Isolation Materials

* Short-circuit protection

* Fully compatible with the original laptops

* Tested with strict quality control standards



Buy with confidence!



* 24 Month Warranty

* Ship the same or next business day Guaranteed

* 24 x 7 Email Support

* 100% New Components - never refurbished, recycles, or used

* 100% OEM Compatible - Guaranteed to meet the specifications of your original device



Copyright Yustda All Rights Reserved.

• World Wide Input Voltage 100-240VAC 50/60Hz.
• Replacement AC Adapter/Charger ,100% Compatible with the device model listed.
• Charger/Adapter has total 10 Ft Long power cord.
• Safety Features: Over current protection; Total power protection; Over voltage protection; Short Circuit Protection.
• Manufactured with the highest quality materials. Certification: FCC, CE and RoHS.

Product description

Troubleshooting:

Some customers may find the Bluetooth can't be connected or found. Here is the solution.

1. Power off the M8 and your phone.

2. Wait for 5s and then power on both.

3. If it still can't be discovered, repeat 1 and 2 and it should work.

If the problem can't be solved, please contact us

Specifications:

• Tube: 6J2
• Amplifier Chip: TPA3116
• Rated output power: 2*30W /8Ω, 2*50W /4Ω
• Audio input: 1 set of RCA input; 1 * 3.5mm stereo input; 1 * Bluetooth input
• Audio output: 1 set of Banana Speaker Jacks
• Signal to noise ratio: ＞99dB
• Frequency: 50Hz-60Hz
• Dimensions: 16*11.5*7 cm (including tube height)
• Power supply: universal DC 19V 4.7A

Packing List:

• 1 * Power Amplifier
• 1 * Power supply
• 3 * 6J2 tube (one spare tube)
• 1 * Bluetooth antenna

Troubleshooting:

For noise issue:

• There is a large probability that the low-quality audio cable causes the static noise.
• Please make sure the sound source is fine since tube amplifiers will amplify all sound including the noise.
• Please check whether the tubes are plugged well on the tube sockets or not.
• Devices like routers, mobile phones will also interfere in the audio signal and may cause static noise.
• If your problem can't be solved, please feel free to contact us. We will be very glad to help you and try our best to make you satisfied.

• Vacuum tube power amplifier with Bluetooth, 3.5mm jack and Stereo L/R RCA input
• Power amplifier uses TPA3116 as the core chip, 1.2MHZ modulation frequency, high-power output distortion of less than 0.1% (10W), up to 50W + 50W dual-channel output power
• Audio signal input can be computer, CD, phone and lossless player, or use bluetooth function to connect Phone and Tablet PC
• Easily switching between different sound sources with its audio input selection
• Treble & bass adjustment; Sound is warm and broad; No background noise; Gold-plated for input and output terminals; 6J2 valve tube; Mini size suitable for desktop

User questions & answers

Question:	I recently purchased this amp and now it won’t turn on. When the power is on it makes a high pitched wine and no leds turn on
Answer:	Hello. We are very sorry about it. Don't worry. We can help you solve it or offer a replacement. Could you please contact us via email directly? If you don't know how, please visit https://www.amazon.com/sp?&seller=ADPE7GPX91ORE and click the "ask a question" to find us.
Question:	Which one of speaker outlet is for the right speaker and which one is for the left speaker? asking to be sure
Answer:	The connection for the left speaker is the closest to the power(in) plug there are also a little "right left" demos on youtube you can use to check
Question:	Is there any other Valve model that fits and can make the amp sound better
Answer:	I think you have to look first for better sound in Better speakers.. and don't play normal pm3 but use / test with lossless music (YouTube or..)
Question:	I'm not seeing speaker any speaker connections on this unit. How do you hook up speakers to i
Answer:	Hello. We are sorry the pictures are wrong, We have corrected it. There is a pair of speaker terminals on the back. You can use standard banana plug or bare speaker wire to connect it.

Product description

The Bellari PA555 Preamplifier. uses a 12AX7 tube running at 150 volts. The input signal is connected directly to the grid of the tube and all of the gain of the PA555 is from the 12AX7 tube. The PA555 has a no feedback circuit or integrated circuits in the audio path, it is all analog. Box Contains Bellari PA555 Preamplifier Made in USA PA555 15V power supply PN PS27s Owners manual

• Input Impedance: 10K ohms
• Max Output Gain: 11.1 dB
• THD: 0.1%
• S/N Ratio: 103 db, unweighted
• Frequency Response: 5 Hz – 198 KHz +/- 3 db

User questions & answers

Question:	Only one output? How would I connect a subwoofer
Answer:	It depends upon the type of subwoofer you have. Some powered subwoofers have their own crossover so that you can run your pre-amp output to the subwoofer and then back to your power-amp. If your subwoofer doesn't have its own crossover you can get a relatively inexpensive Rolls crossover that will do the trick. If your subwoofer is passive, you'll have to first route to your power-amp, then to the sub. You can do that by connecting both your sub-wires and your speaker wires to the same output on your power-amp. doing it this way means that both your speakers and your sub-woofer are trying to reproduce the lower bass but that might be that important in your situation. Good luck!
Question:	Does it work in solid state as well, without tube
Answer:	No
Question:	IS that a volume knob
Answer:	Yes, that IS a volume knob. The one drawback to this unit is that it has only 4 inputs one of which is the little input on the front. So if you're running 4 RCA inputs you'll have to do some juggling.
Question:	Does input switching work in passive mode, i.e., when its not powered UP
Answer:	The selector switch is passive and does not require power, but the unit will not have any output signal as that does require the unit to be powered on.

Product description

Specifications:

Tubes: 6K4 × 2

OP-amp: NE5532

Audio Input: 3.5mm Audio jack, Stereo L / R RCA

Audio Output: 6.35mm

Headphones Maxpower output: 600 mW / 62Ω, 900 MW / 32Ω, 1 W / 16Ω

Frequency range: 20Hz-20 kHz (± 3dB)

THD: ≤0, 03%

Matching headphone impedance: 32-600 Ω

NR: ≥ 95db

Operating voltage: DC12V

Input sensitivity: 0.2mV

Dimension: L99 * W98 * H33 mm

Net weight: 0.25 kg

Model direct replacement tube: 6j1, 6AK5, EF95, 5654, 403B etc.

Packing List:

1 * headphone amplifier

2 * 6J4 vacuum tubes

1 * DC 12V Power Supply

1 * 6.35mm to 3.5mm Adapter

Tips:

1. When you use this product for a long time,please do not touch it by your bare hand, it may hot,but please don't worry this is a normal phenomenon.)

2. Please plug the power supply after all the connection been done for safety;

3. We recommend using 32~600Ω headphones, while armature earphones and headphones that have low resistance and high sensitivity are not suitable.

4. For noise issue, please keep it away from devices like routers, mobile phones or something that may interfere in the audio signal.

5. Please make sure the tubes completely pushed into the device, incompletely connection will cause noise or poping sound.

• ❤Excellent sound performance: Low ground noise, built-in output protect circuit, no buzzing or ringing noise, Audiophile-level sound quality, exclusively designed for the customers who pursue HiFi sound; and safe for your expensive headphones
• ❤Stereo and Preamplify: Headphones amp also can be used as stereo preamp, Parallel 3.5mm and RCA stereo inputs, 6.35mm headphone output, include a 6.35mm to 3.5mm adapter;
• ❤High-performance: P2 is a Hi-Fi tube headphone amp, 2 X 6K4 J-Grade tubes can easily power high-performance headphones including the HD580, HD600, HD650, K701, K702, Q701, and many more, recommend 32-600ohm headphones
• ❤Easy replace tube: Tubes can be replaced by 6j1/6J4/GE5654/6AK5/6*1n/ E180F/6ж9П/EF861/6688 tubes etc
• ❤Exquisite appearance: Small Compact Size, All aluminum alloy shell and come with a 18-month manufacturer's warranty.

User questions & answers

Question:	What are some good replacement tubes for this
Answer:	I think the GE 5654W tubes are a good replacement for this amp. https://www.amazon.com/dp/B087LXW6RL?ref=myi_title_dp
Question:	Was everyone satisfied with the quality of the vacuum tubes provided? If not, what might be a worthwhile upgrade
Answer:	I've sampled Brimar 5749's and GE 5654's and the ones that came with -- the differences are subtle (the tubes on this are only for the pre-amp stage) -- no complaints for the $50 price tag -- it's as good as any headphone amp I've tried under $150 and mine has been working perfect for over a year
Question:	Can the fosi t2 headphone amp work with the fosi Q5 dac
Answer:	Assuming you mean the p2 headphone amp, yes, it will. You'll need an RCA cable to connect the two.
Question:	This will work so i can listen to my record player with my headphones
Answer:	Hello, if your record player has a built-in preamp circuit, you can use this tube amp to listen to your record player with your headphones. If your record player does not have a built-preamp circuit, you need a phono preamp. You can choose Fosi Audio Box X2 phono preamp: https://www.amazon.com/dp/B07XNTHHBP Hope this can help you. Thanks.

Product features

WHY YOU'LL LOVE IT

Tube-P2 will bring you different hearing enjoyment. You wouldn't expect headphones to need any special equipment to work. You plug them in, turn your device on, and music comes through. But what if you don't just want to listen to your music? What if you truly want to hear it? You'll need something to increase the level of signal that reaches your ears: a good tube headphone amp.

• Packing List1
• headphone amplifier x1
• 6J4 vacuum tubes x2
• DC 12V Power Supply x1
• 6.35mm to 3.5mm Adapter
• AC 110V - 240V

SPECS

• OP-amp: NE5532
• Audio Input: 3.5mm Audio jack, Stereo L / R RCA
• Frequency range: 20Hz-20 kHz (± 3dB)
• THD: ≤0, 03%
• Matching headphone impedance: 32-600 Ω
• NR: ≥ 95db
• Operating voltage: DC12V
• Input sensitivity: 0.2mV
• Dimension: L99 * W98 * H33 mm
• Net weight: 0.25 kg