Headphone Amplifier

Product Description

Experience your favorite songs in a whole new light when you listen to them through the headphone amplifier. This brightly colored gizmo includes a high ... [Read more]

Features

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

Top Reviews

I just like to listen to music
by wei chun lin (4 out of 5 stars)
August 10, 2017

This review is actually a simple comparison of 4 different Headphone Amps.

First, I want to be clear that I am not an audiophile, not even close. I just like to listen to music, any kind of music that I feels right. So, this review just what I personally think about these products, nothing professional.

Here are the 4 headphone amps (the DAC I am using is Logitech 980-000910 Bluetooth Audio Adapter, it will cost $21.98 from Amazon. And I know this is probably not the DAC you want to buy, you may want something recommend from z review or one of the most popular brand Fiio. But honestly, when I compare to those DACs under 100 USD, I just cannot tell the differenc. And the good thing about Logitech is they are Bluetooth and easy to re-pair to other devices. As I said before, I am not even close to Audiophile, that's why I can't tell the difference)
1. Fulla 2 by Schiit: $99 plus $10 shipping, total $109.

I know this is a DAC/AMP, and I know this is a solid-state Amp. But if you buy any of the Tube amp listed below, you probably will buy a DAC to pair with it, after you purchase DAC, the price will be very close. And all the tube amps I compared here are not real tube amp, they are all hybrid. That's why I also listed Fulla 2 here.
2. SMSL T2 2X6J9 Vacuum Tube Headphone Amp: $59.90 from Amazon (Total with DAC $81.88)
3. Nobsound NS-08E Vacuum Tube Integrated Amp: $50 from Amazon (Total with DAC $71.98)
4. Bravo Audio V2 Class A 12AU7 Tube Multi-Hybrid Headphone Amp: $66.98 from Amazon (Total with DAC $88.96)

So now you know all the price, seems like all tube amps are cheaper. But.......if you bought tube amps, I am sure sooner or later you want to try tube rolling, please consider that's also your cost on amps. That's why I said the price of Fulla 2 is close to other tube amps.

Price is the first thing I consider; the second thing is the power to drive headphones.

I don't have a lot of headphones and this review is not about headphones, so please don't ask me any question about headphones. The headphones I am using here are Sennheiser HD600, HD6XX from Massdrop, Sony MDRV6, Sony MDR7506, Beyerdynamic Custom One Pro Plus, Audio Technica ATH-AD900X, Beyerdynamic DT 880 Premium 600 OHM, Beyerdynamic DT-990-Pro-250 OHM, Bose QuietComfort 35, Fostex TH-X00 from Massdrop, Skullcandy Hesh 2 Bluetooth, Philips SHP 9500S, and Monster NTune.

NO, I don't have Beats from Dre headphone. If you really want to know why, please GOOGLE.

Some are cheap, some cost a bit more, some very easy to drive, some needs more power.

Let's say the volume knob is from 7 o'clock all the way up to 5 o'clock. This way will be easier for me to show you how every amp provides the power on the volume. Yes, I know the headphone amp drive headphone is not just about volume but also how well it controls. But again, I am not audiophile, so I don't care about the tech issue and I don't want to see a lot of numbers calculating here. All I care is how the music sound and how loud it can be.

All 4 amps with DAC give you a good sound, but tube amps are a little bit warmer. You won't tell the difference unless you compare them side by side.

When using any headphone is under 250 OHM, you will love any of these 4 amps. They all do a good job. You won't go wrong on any of it. So, money wise, just buy the cheapest one you can find.

Any 300 OHM headphone or above, you need to start choosing. If you use 600 OHM, you can forget about #2: SMSL T2 2X6J9 Vacuum Tube Headphone Amp. You can cross it out from the list, and that's what I did, I don't even bother to roll the tube.

On 300 OHM headphone, Fulla 2, Nobsound NS-08E, and Bravo Audio V2 all give you enough volume makes you headache if you turn the volume all the way up (your ears won't bleed, not that loud), and I only need to turn the knob to 12 o'clock. But not SMSL T2, I need to turn all the way to 4 o'clock.

On 600 OHM headphone, Fulla 2 and Nobsound need to turn to 2 o'clock to my normal listening volume, from 2 to 3 only gains a little bit, and from 3 to 5, it won't gain any more (you can turn the knob and play back forward, nothing going to change). Bravo Audio V2 only need to turn to 1 o'clock to reach the same volume, and from 1 to 4, it only gains a little bit. And when you turn to 5 o'clock on Bravo, it did gain volume more, but it starts distortion, and I don't like how the music sound like that. On SMSL T2, the volume is like someone whisper to your ear even you turn all the way to max, and you need to push earcup real tight to hear what they try to say, maybe good for training your listening skills and how sensitive you are to the sound, but not very good for listen to music.

So, if you want to use 600 OHM headphones and you don't want to spend a lot money to buy a High-end amp, then please choose Bravo.

Now, I am going to talk about how much heat these amps will generate. Because I already cross out SMSL T2, so I only talk about the other 3. (If you really want to know, it's the same as Nobsound)

Fulla 2, you can put your hand on it or just grab it. You will only feel a little bit warmer than your hand.

Nobsound, you can pretend it's not hot and leave your hand on the case for a while and keep telling yourself it's not hot, it's not hot, it's not hot...........

Bravo, you can put your hand on the glass part and do the same thing as Nobsound. But I dare you to touch the heat sink, it can fry eggs!!!!!!

Why we talk about the heat here, it's a safety issue. I don't think you want to leave Bravo on when you go to work or any other reason that you need to leave your house for more than 3 hours, it's kind of like you forget to turn off your stove when you left your house (a very tiny stove). That means you need to power on and off every time you use it and before you leave.

This is not a problem to me, but you might want to know.

Then the headphone jack, Fulla 2 and bravo are both 1/4", Nobsound using 3.5mm. Personally, I like the 1/4 better.

Then the input, Nobsound only has 3.5mm audio input, Bravo has both 3.5mm and RCA input, I didn't try to plug them with different sources and start the music at the same time, I just assumed that it cannot, but you are welcome to try it and let me know how it works. Fulla 2 has 3.5mm at front and USB input on the back. I like the Fulla 2 better here, I can just connect to computer and use it.

Then the external power, both Nobsound and Bravo are using external power charger. Of course, you can carry a generator with you and make it portable. but I will just use it at home.

Fulla 2 just use your computer USB to power it. But if you turn the volume over 3 o'clock, you will need external power. You can use either cellphone mini usb charger at home or battery bank when goes out.

Then function, Nobsound and Bravo are headphone amps only, there is no other output. Fulla 2 can use as pre-amp, DAC, and headphone amp. I use Fulla 2 connect to JBL LSR310S then LSR 305 and it works great, and from different connection on Fulla 2, you can use headphone and speakers at the same time but control the sound from computer not the knob on Fulla 2. (By the way, when you plug in headphone to Fulla 2, it will mute the speakers. But Schiit Jotunheim won't, you have to power off your speakers or unplug the speaker cables, that's Schiit company try to force you do some workout, not just sitting there the whole day, thank you Schiit, Jotunheim is really a nice piece of Schiit.)

On tube rolling, Nobsound need a pair matching tubes, and sometimes it will cause some problem if you didn't buy them right. Bravo just need one.

I can tell you that I tried a lot of different tubes on both tube amps and honestly, I don't feel a lot difference between tubes. I think stock tube works fine on both tube amps. If you really want to try different tubes, then I suggest Amperex on Nobsound. For Bravo, I suggest Baldwin>Sctron>RCA.

Again, I really don't think you need to spend the money on tubes. These are not real tube amps, so the sound changing is not that much when roll tubes. But........ again......, I am not an audiophile, not even close, so.........what can I say.

Finally, I can tell you what I choose, but that's only me.

I keep Fulla 2 and Bravo. One for portable (Fulla 2 with computer, not cellphone, and I usually carry a battery bank with me, so I can just use that as power supply for Fulla 2, or I just plug into computer. Cellphone I use Fiio E12), Bravo in my dining room, so I won't forget to turn off the stove when finish eating. For the price these 2 asked for, you really won't go wrong on any of it. Personally, I like Fulla 2 better, but I just can't say no to this cute but powerful Bravo.
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Great device with a tube upgrade - details of tube used in post.
by 04silvrz (4 out of 5 stars)
February 4, 2017

Wow I LOVE this little box. I have been eyeballing this thing for literally years, I bought the E10K instead of this 2 years ago. But I recently decided to give it a try just for the tube aspect of it. Let just say I am not a audiophile level reviewer however that is only because my budget doesn't allow for the expensive gear needed to achieve that level of hearing detail. However I have been into audio from car to home and now headphones for 20 years.

The ONLY reason I took away a star was the stock tube is pretty much useless. It sounded tinny and muddy, I wasn't impressed at all. However once I changed that out for just a cheap upgrade the Electro-Harmonix 12AU7 EH Vacuum Tube for 20 bucks. Once I made that change it came alive, no more muddy low end and it just opened up everything. I have been able to test this side by side with my Fiio E10k, and this thing just sounds so much more creamy and raw. It gives string instruments and analog sounding synths a throatiness to it, just a raw sounding mid / low tone. It really bring them alive! Then overall the sound is just better, the lows are stronger and meaner while the highs are crystal clear. Another thing that surprised me was it made a overall improvement to movie audio. I feel like it's a more realistic audio reproduction from the movie, again was sorta surprised at the improvement that was actually noticeable.

My testing is done with Audio Technica ATH-900x and Philips SHP-9500. Out of those two sets of headphones I like the sound of the 900x better, not by a huge margin but they just overall have a wider sound and more low end and detail. I have not experienced any sort of feedback noise at all outside of a little bit of click when changing volume level. Which is to be expected. I am using cheap 3.5mm to RCA cable from my DAC to the RCA on the box.

I would recommend this little guy to anyone looking to make a improvement in the experience of your music and movies. I would say the overall experience I would call immersive, it's been fun and worth the money spent imo.

One other thing - the device does get REALLLY hot. There are been many reports of them burning out in a year's time, and with that knowledge I decided to use a old PC fan to cool it. I have attached a picture of my setup for inspiration for yours. I do recommend a fan or some sort of cooling for longevity of the device. In my picture from left to right, Fiio E10k DAC that feeds the Bravo V2 and then a Coolmaster 50mm
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Pretty cool!!! Have really enjoyed it so far!!!
by RaiderCrusader (4 out of 5 stars)
January 14, 2015

Pretty cool. I am about 85% satisfied with it after I installed an alternative tube (JJ ECC82 12AU7 gold pin) but I am confident that I can reach that full 100% after making the suggested modifications detailed on audio enthusiast forums! I am using this in combination with Grado SR80e headphones (modified) and a Topping D20 DAC hooked up to my laptop (Asus F555LA-AH51 --> DAC --> Bravo V2 --> Grados). There are a couple of things that I should note that account for the lost star: 1) this multi-hybrid tube amplifier is not shielded, so it does pick up noise from my iPhone and my computer (@ distances less than/equal to 12"), 2) like others, I would highly recommend swapping out the stock tube with an aftermarket one (I have thoroughly enjoyed the JJ tube I mentioned above), 3) the biggest disappointment I have in choosing this model over the V1 is that this model (V2) does not have trim pots to adjust the bias between the two channels (the volume levels of my left and right channels are not at equal with a bias towards the right channel. To date, my soldering/electronic skills have only been developed building custom speakers/repairing damaged wiring, so I am gearing up to get my arms into finer circuit board work with this amp and install trim pots to account for the lack of them on this model in addition to making the additional mods suggested on audio forums (some great info on Rockgrotto like others have mentioned).
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Amazing sound for the price
by Fred Flintstone (5 out of 5 stars)
May 11, 2013

You know, sometimes I spend too much time researching a purchase. This was one of those times. I had made the mistake of buying an underpowered Fiio e6, and I regretted it. So I decided to invest some time in figuring out what would be a better headphone amp. Well, some might say anything is better than a Fiio e6, and I would agree with you. But I had some specific requirements. I wanted a nice sounding amp for work. It had to have some power behind it. It had to be inexpensive in case someone walked off with it. I didn't care what it looked like. I saw other tube amps and thought, yes, maybe later, and definitely not for work. But then I spotted this little guy. Then I went to head-fi.org and found more information than I wanted about this little guy. It's got a tube, yes, but it's a hybrid amp, meaning it's also got some solid state stuff inline. Ok, but it's still Class A.

Two weeks after running it all day at work, it has burned in some (yes, burn in is real, at least for tubes). I'm running ATH M40's (not the best, but good), and I tell you what: this thing rocks. Yes. It rocks. I guess you can find better amps, cleaner amps, amps with more tubes, or amps with no tubes. But this thing gives you a little of both worlds, and to my ears it is exciting, clean, and fun. I have cried listening to some of my music with this little thing. I'm listening to it as I write this. For 70 bucks, you can't beat it. It's just that good. Yeah. Definitely recommended.

Update June 2014: After more than a year of using this amplifier, it is still going strong. I use a Thermaltake Mobile Fan II External USB Cooling Fan - Us to cool the unit, which I believe helps extend its life (the heat sinks do get hot). I've long ago discarded the stock tube, and tried a whole lot of different 12AU7 vintage tubes purchased from auction websites (which have proven to be superior to the stock tube). I have tried other, better headphones than those mentioned in my original review, and this amp drives higher impedance cans with ease.

Is it a giant killer? No. There are better tube amps (the Vali Subminiature Hybrid Headphone Amplifier is a better hybrid amp, and it's made in the USA). But this amp represents something significant: it is the least expensive hybrid amp (meaning, tube and solid state) that you can buy, that really sounds good, and can drive lots of different headphones with ease. It also permits "tube rolling", which means you can exchange tubes easily just by turning it off and plugging in a new tube. You can use 12AU7, or 5963 tubes, 5814 tubes, or 6189 tubes as well (some can be purchased for well under $10). Visit head-fi.org and search for the discussions regarding this amp for more details.

It has its flaws, but they are harder to find than you might think. The price has dropped $8 or so since I bought mine, so it's an even better deal than it used to be.

If you want a cool looking budget amplifier that can be driven by an ipod alone, or by a DAC, or a CD player, then this is an excellent choice. I highly recommend tossing the standard tube, and purchasing a vintage 12AU7 from an auction website (skip the new tubes, they just don't sound as good).

If you aren't on a restricted budget or prefer something Made in the USA, take a look at the Schiit Vali mentioned above.
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Originally sounded great, but began crackling a lot after 4 months. UPDATED
by david a piazza (1 out of 5 stars)
February 6, 2017

I purchased this amp in September and it sounded great. Really liked it and well worth the cost. But now, in January, conveniently after the 90 day warranty is up, it has begun making terrible scratchy noises and bad feedback. I've switched every component, including the tube, to see what the problem is, and it's the amp. I've tried multiple times to contact Bravo and they a have ignored my emails. I'm disappointing since it started out so great. Bad customer service is just the cherry on top of this unfortunate situation.

UPDATE:

Amazon had no problem returning it for me, and it wasn't until after that and this review that someone from Bravo contacted me. They were willing to help, but it was already taken care of by Amazon. What dropped this to a now 1 star review is that I was charged a restocking fee on an item returned BROKEN UNDER WARRANTY, which is crap. It's not my fault, so I should not be penalized. I had already repurchased the amp, because I have 12AU7 tubes and I don't want to have to get rid of my tubes or buy a much more expensive unit. But if anything happens again, I am done with Bravo.
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I've got a nice set of PSB speakers for the main system but ...
by mckenziedrums (5 out of 5 stars)
September 2, 2016

My background: Musician, not necessarily audiophile. I appreciate hearing the details in music. I've got a nice set of PSB speakers for the main system but with a wife and toddler I can't crank those up all the time.

I have a set of Sennheiser HD250 Linear II's that apparently have developed a bit of a cult following. I'd had them for years and when we just recently moved I found them and decided to give them a shot. Years ago I remember them being way way quiet powered from an ipod or computer. I'd always thought of getting an amp but put it off. Well in honor of dusting them off I wanted an amp, but I wanted it to be less than $100 so I didn't have to sleep in the new guest room. These headphones are rated at 300 ohm and most of the completely solid state amps simply didn't have the specs to drive them. Compared several little tube hybrids and decided to give this one a shot. It has all the power I need to drive these headphones and they certainly sound better than they ever have.

The stock tube IS harsh... I went ahead and ordered up an Electro-Harmonix and I will say that was exactly the sound I was looking for. I've been listening to several hours of Floyd and Rush and hearing amazing details in the FLAC files. For the moment it's connected to the headphone out of my Mac with no DAC but at some point I may add it. If you're not a diehard audiophile you will find this to be a worthwhile investment to drive better headphones. I'll try to remember to update this with impressions after this tube gets broken in a bit but so far I'm pleased, especially at this price point.
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Perfect Little Budget Amp
by Art V.H. (5 out of 5 stars)
December 26, 2018

I have limited experience with high-end home audio, but I do appreciate good sounds enough to invest in nicer equipment than most.

The Bravo amp arrived in a little box, sealed up pretty well (pre-assembled), with the tube-amp wrapped in a bag. Everything was securely closed, and functioned right out of the box.

Setup was pretty straightforward, I opted to use the RCA adapter (with a MediaBridge cable) instead of the 3.5mm jack. Plugged in DT990 at 250 Ohm, and away we went.

Sound quality is pretty good--depending on source files, and a host of intermediary steps. Volume control is easy, sounds more or less linear, and rarely do I have to push it above about halfway for comfortably loud music.

It's been with me for about two and a half years now, through a couple moves, without issue. I clean it out occasionally with compressed air (especially around the heat sinks, which can get WARM), but otherwise it just sits on my desk and doesn't complain.

There is a noticeable difference between my laptop and the amp (and moreso between my phone and the amp), which is especially pronounced over longer listening periods.

For the novice, or the budget conscious, I would say this works quite well. It's not too flashy, and does what it is supposed to without being exorbitantly overpriced.
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I'm poor, but I want to be an audiophile!
by Teflon Don (5 out of 5 stars)
September 16, 2014

Few things can completely change the way you listen to music like a tube amplifier. Bravo Audio has created a small, yet powerful, and minimalistic headphone amplifier in the V2.

Being an audiophile is considered a luxury hobby, with headphones easily reaching the 5 digit range, amplifiers going even higher, and the whole host of other "necessities" to be considered an audiophile being out of the price range of most average consumers, audophilia is left to the stupidly excessive. But what about those of us who love music with a passion and want to listen to music louder and crisper, but don't have an absurd amount of money to drop?

In comes Bravo Audio V2 to the rescue! Sitting at a pretty price range of around $50, almost anyone with the slightest hint or desire to try out a tube amplifier should be looking towards the V2. It is small, easily fitting on my desk next to my laptop. It's open design is very modern, and while it was most likely done in an effort to alleviate overheating, looks very cool. The slight blue glow from the tube looks like something out of a sci-fi high tech movie, and people are stunned by it every time.

Sound wise, it's simply outstanding. With more power running into your headphones, music comes alive. Instruments separate and you can hear different locations of instruments within the music. Bass is bigger, treble is cleaner, and the mids feather out the two much better to create an impressively more concise musical experience. While streaming music or playing MP3s is great, to really get every ounce of quality out of your amp, look to find and download lossless music. Specifically .flac

I do not have a DAC just yet, but I still want the best quality I can get out of my laptop, so I use a 3.5mm to RCA input cable into the amp, which I feel fills out the sound much better than simply a 3.5mm to 3.5mm dual audio jack cable. There is a slight and constant hiss in the background, usually during pauses within the music, it completely disappears when nothing plays for a second or two, and is mostly inaudible during the music. I feel this is more of an issue with the sound card and signal transfer through that 3.5mm to RCA cable than it is as a result of the amplifier itself. Thus, I refuse to take away a star just yet, if I get the DAC and see that the hiss is still audible, then I might decide to drop it one star.

Another very slight negative is the tube itself, it's cheap and so is the sound it produces. It's not terrible, and as I described earlier, it definitely does an amazing job of separating music and making it much cleaner, and for most will do just well. I expected the tube to not be the greatest from how low the price of the entire unit is. But if you just spent money on something as excessive as a tube amplifier just to listen to music, "just well" is not good enough. The tube amp is great, don't get me wrong, but when I switched the tube to the Genalex Gold Lion 12AU7 Tube, WOW! Simply eargasmtastic.

Bottom Line:
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Don't have enough money for an amplifier that's more expensive? Buy this one and you definitely won't be disappointed!
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Great for the price. Keep it away from router/cell phone.
by Z (4 out of 5 stars)
October 8, 2019

Decent amp for the price. I would definitely recommend upgrading the tube from the stock original. It powers my Beyerdynamic DT 990 PRO (250 Ohm) headphones pretty well. I have it connected to a cheap, Fosi Audio DAC-Q5.

Some advice if you own this amp or plan on buying one (I wish I knew about this a long time ago....): make sure it is 5+ feet away from any router, cellphone, etc. You will get a very annoying white noise, humming, buzzing, static, etc. from the signals they give off.

Only other complaints I have are that it gets pretty hot after being on for a bit. I also am not a fan of the RCA cables needing to be put in the side of the amp instead of the back.
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Wow - Great little Amp!
by Amazon Customer (5 out of 5 stars)
December 18, 2013

I've had the Bravo Audio V2 for only 3 days but I've found myself 'connected' to it most of the time that I am at home (no Netflix or Amazon Prime for the last 3 days!). The sound is great, I am impressed at the improvement I got for such a small investment.

I am using an iPod touch connected using the Line-Out to RCA on the Bravo which is driving my 8 year old the Sennheiser HD590.

As my Sennheiser HD590 are not as demanding as the newer HD600 (and above), with a rated Impedance of 120 ohms (Vs 300), I've always liked the sound straight out of my iPods and MacBookPro. Looking to see what is all the hype about headphone amps, and knowing my cans could handle a bit more power than an iPod I started looking. The idea of trying a hybrid amp was appealing to me as my musical taste goes from hard-rock to classical with jazz and blues to the mix and everything else in between including electronica. The Bravo V2 fitted the bill and at a price point I could experiment!

The first thing I noticed was a fuller and more spacious sound and a beter soundstage. My cans gained new life!

I also noticed that with the included tube (china-12au7) the sound was too bright (aggressive actually!). But It was no surprise as other reviewers claimed the same, so when i bought the Bravo I also bought 3 more tubes with it for experimentation:

The Behringer 12AU7, the JJ Electronics 12AU7 and the Groove Tubes ST-12AU7 Preamp Tube Silver.

It's really interesting to start rolling tubes and noticing the different nuances that they bring to the sound.

First one I tried was the Behringer and the difference was staggering. The sound was now a lot smoother and more melodious. The vocal performances gained a new life without bringing the mids up overall. The aggressive treble was gone, but so was the bassy punch and although i really liked the Behringer, I usually prefer a darker sound and a bit more bass. The treble was also a bit too soft in some musical styles like hard-rock.

After some more hours of listening to the Behringer, I swapped it with the JJ Electronics. The JJ enhanced the treble. It wasn't an issue anymore for Hard-rock! The bass was still smooth though (almost lacking) and now, the vocal performances were not as astonishing. One thing that i noticed too was the electronic interference from other devices (like my wireless router). I do not hear any interference at all with the other tubes...

So on to the last tube: the Groove Tubes ST Silver. The bass is back! the sound is a bit more bright too, but not enough to cause fatigue even after multiple hours of listening to high volume music. Currently this is my default tube. It works very well with all musical styles although I feel it performs better for rock and electronica. (I need to do some more swapping, but my feeling is that the Behringer is my preference for classical and blues).

Not knowing what to expect from this amp and knowing that it came with a vacuum valve I started with classical and blues which sounded really good and improved compared to just the iPod. But my biggest surprise was when I played Jambi from Tool. I could not believe my ears! The bass was immersive and the drums packed a punch all with a nice control to it. I kept listening amazed as I was moving to different bands (Foo Fighters, Evanescence, Rammstein, Muse, etc.).

In sum, this amp has improved the sound on my Sennheiser HD590. To all musical styles too (although I may have to swap the tube for some :) ). I've also found that if you are willing to do some soldering, you can improve it even more with some simple mods. So far I don't feel that need, I may keep trying different tubes (maybe invest on a 1958 Mullard or Siemens and go vintage :) )

I am very pleased with it, specially for its cost! If you have a decent pair of cans and you want to go to the next level without breaking the bank (less than $75!), this is it. Look no more!

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