Pros: Inexpensive, easy to tube roll
Cons: The stock tube really sucks
In the world of Budget-Fi audio, there is a relatively small set of amplifiers that can be purchased for under $100 USD, and an even smaller set of amplifiers in that price range that are hybrid tube amps. The Bravo V2 is one of those amps. It can be purchase on auction from eBay for about $50-55 (depending on how many people are bidding), or at a fixed price of $69 from either Amazon.com or eBay (the seller/manufacturer on eBay ships from China and charges $16 for shipping that takes about 2 weeks to the US).
By many accounts, this device was designed using DIY project specifications readily available on the Internet, which have existed for some time. Those who purport to know much about these things say that it's not a particularly sophisticated design, and requires numerous modifications to really sound good. Some even question whether this is truly a Class A amplifier.
On the other hand, whaddya want for $69 bucks, bro? This isn't a Bottlehead Crack, or a Schiit Valhalla. It's not made in a numbered garage either (though the residents of that numbered garage seem to spend an inordinate amount of effort slamming this little product, and have become so annoying to me that I've decided to never, ever consider their products, for any reason, under any circumstances). If you're shopping for an amp in this price range, then the driving factor really is your budget. So we're talking bang for the buck here. All comparisons to more expensive devices are pointless. Yes, you can buy better amps, but so what?
What this is, is a really cool little amp that sounds damn good for $69 bucks. I own two of them. I'm going to mod one of them soon, and write a comparison of them when time permits. (Oh, don't preach to me that I could have bought X or Y for the price of two of these devices. I want two amps for two different locations.)
But, really, you need to get rid of the stock Chinese tube. Quickly. Okay, you can listen to it while you're waiting for your American NOS 12AU7 / 5963 / 5814 (etc) tube to ship from eBay. Unless you're really filthy rich, don't waste your money on a Mullard or Telefunken (which can easily cost more than this amp).
I've written a comparison of this amp against a Schiit Magni here. I've also made some tube rolling notes in this thread. In short, this cheap little hybrid amp sounds pretty darn good for the price, and I don't think there is anything in its price range that can compete with it, short of a Schiit Magni. Quite frankly, which one wins depends on the cans you're using, and what style of music you like to listen to.
Some day, I think it would be interesting to get or make a cMoyBB, just to make sure that this is better. To date, it hasn't been that important. Portable amps aren't really something I use. But I am curious. So maybe someday.
I highly recommend this amp to anyone who has $100 bucks to spend on a headphone amp, wants to have a tube type amp, and isn't shy about using eBay to purchase an accessory. Do NOT buy any 12AU7 replacement tubes from Amazon - they are all junk. If you don't want to use eBay, or don't care about tubes, then buy a Schiit Magni. The Magni is an awesome amplifier, hands down. It's just not a tube amp.
Both amps are outstanding values in this price range. Neither one of them is really "better" than the other - it's personal preference in this range.