9 best stereo tube amp for the money

Product description

Point to Point hand welding, preferred audiophiles, output transformer switch to the 76x40 higher end output transformer.

Please pay attention before buying!! Nice sound but LOWER POWER.If you like high power or your speakers do not match, it may cause sound distortion.

Specification:

Output Power: 6W * 2 (Ultra-linear).

Frequency response: 20Hz - 28KHz.

Output Impedance: 4,8Ω.

Total harmonic distortion: ≤ 1% (1kHz).

SNR: 88dB.

Voltage amplification: 6N2J × 2.

Power output tube: EL34 × 2.

Rectifier tube: 5Z4PJ × 1.

Input sensitivity: 750MV.

Input impedance: 100KΩ (2 groups input)

Dimensions (W × D × H): 310 × 268 × 165mm.

Power Supply Voltage: AC 110V - 120V / 50Hz-60Hz (For United States)

Power consumption: 78 watts

Features:

Power Transformers: new imported 0.35, stack thickness 50MM (96-50).

Output transformer core: new imported 0.35 (76*40upgrade version).

Chassis: imported mirror stainless steel chassis.

Corners aluminum column: high-grade aluminum CNC machining, diamond knife speed car system.

Output Block: High-grade export base, with a transparent cover.

6N2J pre-voltage amplification.

EL34 as power output.

Potting type output transformer, to ensure the stability and reliability of the output transformer, especially in the southern humid places, have a more reliable performance.

Output transformer with a new imported 0.35 core manufacturing, high-purity copper wire package enameled, layered segmentation, string and connection method, divided into three clips two around the system,

Output transformer transformer housing with high-grade stretch hood. High temperature paint surface treatment, bright pattern processes. Nissan ALPS potentiometer.

Imported 0.35 thick core manufacturing power transformers, to ensure adequate power and low temperature rise.

• Please pay attention before buying, We received feedback from many buyers, reflecting that Reisong A10 Amp have not enough power. Please confirm that your speaker is a bookshelf speakers with a sensitivity 89db or more. We don't think Reisong A10 work well with a floorstanding Speaker or the low sensitivity speakers.
• Manual welding, preferred audiophiles, output transformer switch to the 76x40 higher end output transformer.
• If there is no sound from the machine after waiting for a few minutes, Please make sure the power is connected properly. And try pressing the Black Circle Button on the back of the machine (for switching between AUX and CD modes)
• Tube EL34 x 2,6N2J x 2,5Z4PJ x 1
• Reisong Boyuu A10 Amp with tubes protective cover. If you need a circuit diagram, please contact us by email, thank you.

User questions & answers

Question:	Is this the one with point to point wiring and the tube cage
Answer:	To get an accurate sound-stage, with nice airy separation of instruments especially with small jazz groups, I find you MUST make sure with your hamsters or ferrets: a) they are, and always have been, feed on high quality oil and paper based feed. b) their claws are kept well clipped. If you don't do this you will get a lot of 7th and 9th harmonic distortion. This will totally mangle the slew rate of the amp, and could (even worse) lead to parasitic oscillation at high frequencies. House mice ? don't bother, I caught a few and tried them. Terrible sound.
Question:	Can I plug an audio technica record player directly into this amp or do I need a pre amp? (I don’t really understand what pre amps do
Answer:	You need to be more specific with your question: Adequate volume = ?? dB? Sensitivity of the Wharferdale speakers: ?? dB/m/watt? Room dimensions: 18x20x? feet? Is the room alive (lots of slap echo) or relatively dead (lots of soft cloth curtains, couches)? I play my music to as high as 85 dB on my 89 dB speakers in a room that is 16 x 30 x 9 that is reasonably alive (glass windows, plastic blinds, hardwood floors) and the amp drives it fine.
Question:	Can i replace 6n2j tubes with 12ax7/ecc83 tubes? in case stock 6N2J tubes go out
Answer:	Definitely, unless you are playing hard metal rock to ear splitting level. It drives my 8 ohm, 87 dB sensitivity speakers to satisfying level. Go for it.
Question:	My brother said if the tubes are removed and the unit is unplugged, it can be used as a carrier for hamsters (to take them to the vet). Is this safe
Answer:	My speakers are 89 dB sensitivity and I can hear tube hiss at 12 o'clock on the volume control if I put my ear on the drivers without music playing. Not a problem at listening position and at 12 o'clock the music is plenty loud in my biggish room (40x18x9). At 105 dB it may be a problem but I guess you won't need to crank it to 12 o'clock either. Hope that helps. Overall I am very happy with the purchase. Great value, great sound, well built amp. The support service has been quite responsive too. Good luck

• Bluetooth 5.0 & Stereo RCA & MM Phono inputs: can be used as tube amp or MM phono amp, and input signal can be losslessly switched via input selection, perfectly compatible with most audio device such as phone, computer, TV, CD player, DAC, MM record player and so on.
• GE5654 vacuum tube & HiFi Sound: filter out the digital sound of common audio sources to get warm and sweet, delicate and mellow sound, much softer and more listenable, full in mid, powerful in low and clear in high frequency. No need to change or upgrade other vacuum tubes.
• Super large output power & low frequency output: adopting TDA7498E amp IC whose max output power can reach 160W+160W(4Ω), and equipped with 32V/5A power supply, easily to drive most home passive speakers. And adding subwoofer output, convenient to connect active subwoofer and build 2.1 audio system.
• Perfect Design & Powerful function: with tone control, easy to get more smooth and delicate sound by adjusting treble and bass knob, and bypass function is added to enjoy original sound. Vacuum tube circuit can be also bypassed, easy to compare the difference digital sound and tube sound, adding much fun and higher playability.
• Exquisite Appearance & Proper Size: metal black case and vacuum tube with blue and orange decorating light looks fashionable and attractive, designed input switch / tube and tone pass & bypass switch, very convenient to use and suitable for stereo home and desktop audio system.

User questions & answers

Question:	I recently purchased the douk audio x1 amp to add to my p1 headphone amp. how do you make them discoverable as neither show up in mybluetooth devices
Answer:	This is a Bluetooth tube preamplifier,so you can connect it by bluetooth,any other problem,pls contact us by email,thanks

Product features

Multiple Inputs

• Bluetooth 5.0 & Stereo RCA & MM Phono inputs
• Can be used as tube amp or MM phono amp
• Compatible with most audio device such as phone, computer, TV, CD player, DAC, MM record player

Hi-Fi Tube Sound

• GE5654 vacuum tube
• Warm and sweet, delicate and mellow sound
• Full in mid, powerful in low and clear in high frequency

Perfect Design & Powerful Function

• Tone control (treble and bass knob)
• Bypass function to get original sound
• Vacuum tube circuit can be also bypassed

Super Large Power & Active SUB Output

• TDA7498E amp IC
• Max output power can reach 160W+160W(4Ω)
• Equipped with 32V/5A power supply
• With active subwoofer output to build 2.1 audio system

Douk Audio X1

• Audio input: Bluetooth 5.0 / stereo L/R RCA / MM Phono & Turntables
• Audio output: banana speaker jacks / Low frequency output (connect active subwoofer)
• Bluetooth chip: QCC3008 (support APTX / APTX-LL)
• Amp IC: TDA7498E; Op amp: NE5532
• Max output power: 160W+160W(4Ω load)
• Speaker impedance: 4-8Ω
• Frequency response: 20Hz-20KHz(±3dB)
• SNR: >90dB; THD: 0.5%; Input sensitivity: 0.775V
• Treble and Bass range: ±6dB
• Working voltage: DC 19V-35V

Front Panel

Back Panel

• 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.

Product description

Features:

With 5 kinds of audio input (Bluetooth, USB, Coaxial, Optical, RCA) and 3 kinds of audio output (Banana speakers, subwoofer, 3.5mm headphone), compatible with almost all audio devices such as mobile phone, notebook, PC, PSP, CD players and so on to meet the different needs of home audio systems.

Low-requency signal output is speciallyed designed to connect active subwoofer, strengthen bass sound effects to bring more shocking experience just like in the cinema. With treble and bass control to bring more delicate sound according to your own listening style.

Using 6P1 and 6N1 vacuum tubes, the sound is clear, warm, smooth and delicate, U-disk supporting lossless music formats such as WMA/WNV/MP3/FLAC to provide HiFi enjoyment.

Unique design and attractive appearance, exquisite black lacquered panel and retro vacuum tube are combined to create a luxurious and elegant artistic atmosphere, very suitable for home and desktop audio system use.



Parameters:

Audio input: Bluetooth, USB/U-disk, Coaxial, Optical, RCA

Audio output: speaker jack, 3.5mm headphone jack, subwoofer

U-disk supporting formats: WMA/WNV/MP3/FLAC

Bluetooth version: 4.2

Rated power: 25Wx2

Tube model: 6P1x2+6N1x2

Frequency response: 20HZ-20KHZ

Input impedance: 47

Output impedance: 4-16Ω

Signal to noise ratio: 80DB

Dimensions: 312*270*150mm

Net weight: 4.0KG

Package weight: 5.0KG



Packing List:

1*Tube Amplifier with Power Cord

1*Audio Cable

• MKIII is the upgrade version of our popular MKII. MKIII is added with coaxial and optical inputs as well as active subwoofer output. The circuit design is also upgraded to ensure lower background noise and purer sound.
• With 5 kinds of audio input (Bluetooth, USB, Coaxial, Optical, RCA) and 3 kinds of audio output (Banana speakers, subwoofer, 3.5mm headphone), compatible with almost all audio devices such as mobile phone, notebook, PC, PSP, CD players and so on to meet the different needs of home audio systems.
• Low-requency signal output is speciallyed designed to connect active subwoofer, strengthen bass sound effects to bring more shocking experience just like in the cinema. With treble and bass control to bring more delicate sound according to your own listening style.
• Using 6P1 and 6N1 vacuum tubes, the sound is clear, warm, smooth and delicate, U-disk supporting lossless music formats such as WMA/WNV/MP3/FLAC to provide HiFi enjoyment.
• Unique design and attractive appearance, exquisite black lacquered panel and retro vacuum tube are combined to create a luxurious and elegant artistic atmosphere, very suitable for home and desktop audio system use.

User questions & answers

Question:	Has anyone compared this amp to one of the tripath T-Amps (topping, lepai, indeed, etc
Answer:	Car speakers most definitely can sound good for home use. Nathaniel doesn't have a clue what he is talking about. Will it make all car speakers sound good? No, definitely not. However, there are very high quality speakers out there that are aimed at the automotive market. Are they going to sound like $10,000 a piece speakers, no. However there isn't actually anything that has to be different between a car speaker and a home speaker, other than where it is used. I actually have some Hertz speakers in a project I've been building, and they sound great. Other high end car audio manufacturers are Morel and Focal - and yes, those speakers could also be made to sound great in the home. Unfortunately, the audio world is full of a bunch of know-nothing snobs who can hear the most incredible differences between audio setups - unless they're put in a double blind test. In particular, check out double blind tests done on amplifiers to get an idea.
Question:	Are these tubes all compatible with the u.s. ms-10d? ––– > 6p1 = 6p1p = 6n1n = 6aq5 = 6p15 6n1 = 6n1p = 6н1п = 6n1n-ev = 6h
Answer:	At the first,when you connect bluetooth,turn on it it will have a slight sound,but after a whille ,it will disappear,if still have this sound,pls check your speaker and your power supply.hope you can know it,any problem ,pls contact technical support ,thanks
Question:	Do you need a phono preamp for a turntable record player? Also, does the volume knob control the volume of headphones as well
Answer:	This tube amplifier have two input modes, AUX/ Bluetooth, you can select the input modes by the switch button,if you want to use bluetooth connect it ,pls select toggle to bluetooth modes, search our tube amplifier" aiyima T2 pro ",then connect it. And All of the bluetooth device can only connect one-to-one, not one-to-many,thanks!
Question:	Would this amp make car component speakers sound good for home use? (in boxes, of course.) they are 4 ohm, rated at 250 watt RMS
Answer:	4-8ohm

Product description

Why us?

The Nobsound NS-02E designed by Douk Audio Studio is a powerful Hi-Fi headphone amp. It has an anodized aluminum chassis with a replacable vacuum tube shining blue illumination on the top. The Nobsound NS-02E can provide soft and warm sound while maintaining its exceptional clarity. Most importantly, the affordable price makes both Hi-Fi freshmen and Hi-Fi veterans can enjoy it. And that's exactly one of our targets.

The Nobsound NS-02E can be paired with your preamp, smart phone, computer, iPod, stereo system, and other audio device as well as your favorite headphones. It can easily power high-performance headphones including the HD 580, HD 600, K 701, K 702, Q 701, DT880, T70, T90, SR225, SR325, RS1e. It will also be a good match for active speaker systems.

The Nobsound NS-02E can also be used as a tube pre-amplifier. You can connect it with any types of power amplifier to upgrade the musicality and dynamic of the original system.

What's more, its high playability can provide more pleasures for you. The default tube is 6N3, which can be easily replaced with various types of tube as below:

• United States: 6A8Q, 2C51, 5670, 5185, 6385, 6185, WE396
• Europe: ECC 42
• Soviet Union: 6H3N, 6H3II
• Germany: ECF82
• Czech Republic: 6CC42

Definitly, you will always find a place for it in your stereo system.

Specifications:

• Tube: 6N3
• Output power: ≥1100 mW (32 ohm)
• Adapter Headphone Impedance: 18-600 ohm
• Total harmonic distortion: <0.005%
• SNR: ≥110 dB
• Frequency Response: 20 Hz – 30 kHz
• Size: 90 * 90 * 39 mm (L * W * H; 3.54 x 3.54 x 1.54 inches) /H: 80 mm with tube and feet
• Net weight: 165g
• Colors Available: Black, Silver
• Input and Output Audio Jacks: 3.5 mm

Package include:

• 1× NS-02E amp
• 1× power supply

• The Nobsound NS-02E can provide soft and warm sound while maintaining its exceptional clarity.
• The default tube is 6N3, which can be easily replaced with 6A8Q, 2C51, 5670, 5185, 6385, 6185, WE396, ECC 42, 6H3N, 6H3II, ECF82, 6CC42.
• The Nobsound NS-02E can be paired with your preamp, smart phone, computer, iPod, stereo system, and other audio device as well as your favorite headphones.
• The Nobsound NS-02E can also be used as a tube pre-amplifier.
• The affordable price makes both Hi-Fi freshmen and Hi-Fi veterans can enjoy it.

User questions & answers

Question:	How many amps does the 6v power supply push? What are the ratings
Answer:	2A
Question:	Will changing the standard 6N3 tube to one of the other tubes listed in the description change the quilty of sound
Answer:	It can change the character of the sound yes depending on the tube you switch to.
Question:	Hi: this product says 'diy' in the description. is it a kit, or do you basically just need to put the tube in and plug in the power supply? tia
Answer:	im not sure why it says diy.. it came complete in box. All you have to do is plug it in to the power adapter and its ready to go.
Question:	I have a solid state amp and want to add a tube amp to the mix. Is it possible
Answer:	If you have a line level out on your SSA then yes.

Product description

Product information

• IP Level : 6N1x2/6P1x2
• Amplifier Chip : 2955/3055
• Output Power (Rated) : 2X30w
• Output Power (Max.) : 2X50w
• Total Harmonic Distortion : ≤0.05%
• Signal-to-Noise Ratio : ≥86dB
• Audio Input : AUX,Bluetooth,USB,Optical,Coxial

• TUBE HYBRID AMPLIFIER: Front Panel Main Volume/Bass/Treble adjustment knob. Supplied with a replaceable tube. 25 watts x 2 RMS @ 8 ohm. 35 Watts x 2 RMS @ 4 ohm.
• EXQUISITE MATERIALS: Headphone Power Amplifier adopting aluminum alloy oxidation drawing process has stronger protection. Metal cutting knob for more delicate control.
• TUBE PROTECTION COVER: The use of whole Aluminum block mesh for the tube protection not only adding protection to the Tubes, but also provides Decoration and Kids Protection for the hot tubes.
• STEREO INPUT: Super powerful extension, multiple audio sources. Connectable with Powered Phono Player/PC/Smart-Phone/CD & DVD Player/TV by using RCA/Optical/Coaxial, Bluetooth connection only for Smartphone. Smart connection allows you to enjoy the of music in many ways.
• PERFECT SERVICE: 6 months warranty gives you a great shopping experience. If you encounter any problems, please contact our customer service team immediately.

User questions & answers

Question:	What type of valves I can use as replacements
Answer:	It is a tube amplifier (as opposed to solid state), so they are integral to the function of the equipment. Looking cool is just a bonus...
Question:	Has anyone used the optical input? i've tried small optical to rca converters for listening to the tv. nothing worked
Answer:	Douk audio lists input sensitivity at 500mv-2000mv... it’s a very decent albeit VERY entry level integrated tube amp. By itself it’s a wee bit weak on the bass response even into quite capable speakers (Klipsch RP-600m’s). I recently added a Chinese made Suca Audio tube preamp $38 which adds +/- 6db treble and +/- 10db bass! Literally night and day difference. This Amp with the addition of the preamp sounds DIVINE. If you decide to buy this definitely but the preamp as well. It made me go from “meh” to “WOW!!!!” Hope this helps.
Question:	What is in the rectangular box behind of the tube? Transformer
Answer:	Keep in mind that the purpose of the meters (besides looks), is to show the true output power being sent to each speaker. If you're looking for more sensitivity or needle action, try using a dj mixer or pre amp that has an equalizer. If you add a little more bass, that will make them much more active. Or, if you have an equalizer, plug your source into the "EQ" input. And the EQ "output" into the AMP "input". Honestly, I wouldn't take the unit apart. It would likely void any warranty. Meanwhile, I've had my amp for about a month now. It's hooked up to a set of JBL S38 Studio Series speakers. I'm MORE than happy. The tubes had time to burn-in, and this unit is the best sounding amp I've owned in 50 years! I listened to a clip on u two-b called hot pipes which features a gigantic organ with symphony. Your house will GROWL from the low notes of the organ! It honestly has just as good of sound as the big movie theater in town. The audio chain in this unit is totally clean. NO hiss, NO hum, NO static. The stereo separation is EXCELLENT. Some instruments jump out at you as if you're right in the studio/hall with them! Whoever designed this amp, knows what they're doing and deserves recognition and praise! There's NOTHING I would change about this amplifier, it's simply perfect.
Question:	Do the tubes have a function or are they there just to look cool
Answer:	Hello. It is 6.8W*2. 6.8W is for tube amplifiers. The power of tube amplifiers is different with digital amplifiers. Normally, it can drive most home speakers. Please note it can only work with passive speakers.

Product description

Warm reminder: You should take about 100h time to operate the amp.RUN-IN to the amp gives it's best and stable sound.so during the first 100h use time the sound maybe is not the best,you can also use your own run-in method.

Specification:

Rated output power:

25W + 25W (RMS Triode)

45W + 45W (RMS Ultralinear)

Harmonic distortion: 1% (1kHz)

Frequency response: 15Hz ~ 30kHz (-1.5dB)

Input Sensitivity: 280mV; 520mV (pre in)

Input impedance: 100KΩ

Output impedance: 4Ω 8Ω

Signal to noise ratio: 92dB

Left and right output balance: <0.5db

Power consumption: 260W

Vacuum tube: 12AX7 × 1. 12AU7 × 2. KT88 × 4. 5AR4 × 1

Dimension (W × D × H): 410 mm × 335 mm × 198 mm

Net Weight: 23kg

Gross weight: 25kg

Power supply: 110V - 120V 60Hz/50Hz.(For United States)

If you need to use it in Europe, there is a selective switch to set it to be 220V-240V ,It works well in Europe too.

Working conditions: Temperature: 0 ℃ ~ 40 ℃ Humidity: 20% ~ 80%

Storage conditions: Temperature: -20 ℃ ~ 70 ℃ Humidity: 20% ~ 90%



Packing include:

1 x Vacuum tube amplifier

1 x English Instruction manual and a circuit diagram(Schematic)

1 x Infrared remote control

1 x Tube protective cover



ONE-YEAR WARRANTY !!!

• MUZISHARE X7 Upgraded version. Upgraded the internal coupling capacitor, is the designer to debug the custom-made silver film capacitor, relative to the classic version of the extension, control, density is better.
• MUZISHARE X7 is an integrated Amplifier. This is also a Power Amplifier (there is a group pre-amp input), a Headphone amplifier and this is a amplifier for Phono player too, direct link your phono player to this amplifier to output to speakers.
• Pure Handmade,point to point hand welding using two high-quality wide-frequency high-quality Japanese EI output transformer using a high-power Z11 core toroidal power transformer dedicated designed for the machine ， voltage amplification and promote are used tube 5AR4 for rectifier power supply.
• Use 12AX7 and 12AU7 vacuum tube for voltage amplification and phase inversion,use KT88 vacuum tube to do AB1 push-pull power amplification; Mute delay function when turn on the amp(about 30 seconds) ；the choice of Japanese ALPS motor potentiometer
• Provide Triode and Ultralinear selection function: Triode work mode. soft. pure and sleek. suitable for enjoying vocals. strings Music and other types of music; Ultralinear work. the sound of open. unrestrained. the momentum is good. for large scenes. large dynamic type of music. Peripheral power tube current adjustment knob and current display meter. With pure power amplifier features. can be linked the pre-amp signal input. with the phono function. can be connected to the Phono player

User questions & answers

Question:	I just bought this beautiful amp, can KT150 tubes be used as well, if so, can you recommend a set
Answer:	I've been using KT120's everyday for almost a year now. Incredible bargain with these tubes. Jan. 2020
Question:	Can i order this with a chinese user's manual
Answer:	BIG one: 6P1 : 6n1n-EB / 6N6 / 6AQ5 Small one: 6N1 : 6H1N / 6H1 / ECC85/ 6AQ5 Kindly remind : The original tube cover inner room may not fit for the replaced tube .
Question:	Purchased Tuesday. When will it ship? I'm ready. thank you
Answer:	I have absolutely no problems with it
Question:	what power tubes can this amplifier accept and be biased for
Answer:	The rectangular box is designed to simulate the style of what would be three large transformers if this were actually were a genuine all-tube amplifier, which it is not. This rectangular box might trick trick your friends (but not you, now that you've read this) into believing you've purchased an expensive all-tube amplifier. However, there is a single toroidal power transformer located inside this large box, although there are no output transformers as the power stage of this amplifier is solid-state (transistorized) and does not use tubes.

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

Warm tips:

1. This is preamp, cannot drive passive speaker directly, need to be used with power amplifier.

2. Default 6J1 vacuum tubes, if you want upgraded US GE5654 tubes please visit:

3. Cannot input DC voltage, or else it will not work or damaged directly.



Features:

With standard stereo RCA input, compatible with many audio devices such as phone,TV, MP3 players, CD players, DAC, computers etc. Connected between audio source and power amplifier to effectively filter the digital sound, making the human voice more real.

Reasonable and simple curcuit layout, the sound is clear with low noise, adopting 2PCS 6J1 vacuum tubes. The tube buffer is amplified by about 2 times, the sound is warm and sweet, full with dynamic. Pluggable tube socket design, easier to change GE5654 tubes and upgrade the sound.

Mini size with exquisite appearance, acrylic chassis looks great when the tubes are giving out blue light, very suitable for home / office desktop audio system use.



Parameters:

Audio input: stereo L/R RCA

Audio output: stereo L/R RCA

Number of Channels: 2.0

Output impedance: 4-8Ω

Working voltage: AC 12V

Dimensions(W*D*H): 81*81*43mm / 3.19*3.19*1.69in

Net weight: 170g / 0.37lb

Package weight: 560g / 1.23lb



Packing List:

1*Tube Preamp

1*AC 12V Power Adapter

• With standard stereo RCA input, compatible with many audio devices such as phone,TV, MP3 players, CD players, DAC, computers etc. Connected between audio source and power amplifier to effectively filter the digital sound, making the human voice more real.
• Reasonable and simple curcuit layout, the sound is clear with low noise, adopting 2PCS 6J1 vacuum tubes. The tube buffer is amplified by about 2 times, the sound is warm and sweet, full with dynamic. Pluggable tube socket design, easier to change GE5654 tubes and upgrade the sound.
• Mini size with exquisite appearance, acrylic chassis looks great when the tubes are giving out blue light, very suitable for home / office desktop audio system use.

User questions & answers

Question:	It's supposed to act as a preamp for a turntable? i plugged my tt into it and then to the amp but the signal is way too low and hi eq ish
Answer:	Its not a phono pre amp.
Question:	I have a keyboard synthesizer with a low volume signal. Is this suitable for increasing the gain before connecting a power amplifier and speakers
Answer:	Absolutely, it adds warm, full range boost to the signal. I use mine as a preamp For my turntable, and it sounds amazing. I’m impressed how gorgeous this sounds for the price. I’m a guitarist of 23 years, and I have yet to use this as a preamp for my effects loop, but now that you mention it I think it will be perfect for that application.