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Bravo Audio V2 Class A 12AU7 Tube Multi-Hybrid Headphone Amplifier
Use as a phono amp?
I'd like to listen to my LP's thru headphones. Could this unit be easily mod'ed to incorporate a MM phono input?
Well, you would need an additional "RIAA" curve device to accommodate plugging a phonograph into your headphones. Many stereo amplifiers have a "phono" output/input. There are separate units as well. I will list some below.
Date published: 2014-04-17
How is the BRAVO V2 as a preamplifer only?
Anyone have experience with this as an AMPLIFIER only? Planning on hooking up an old onkyo m-5160 amplifier and using the bravo v2 as a preamplifier to power my arx a1b speakers. Also will changing the tube change the sounds of the whole product or will changing the tube only change the sound through the headphone amplifier output? THANKS!
The headphone amplifier is also a preamplifier. It is actually advertised by Bravo as being a preamp, too. I have been using it as a preamplifier with the APA150 and it does give it a "warmer" sound.
Date published: 2013-09-07
Can it handle 4 ohm loads?
Is there any precautionary advice against using this amplifier with headphones that have a minimum impedance of 4 ohms?
Unfortunately no, the supported headphone impedance is 20-600 ohms.
Date published: 2013-07-12
How one tube can be in both channels?
I don`t know much about tubes so here is my question:two channels amp with only one tube, is that tube works on both channels or is it just for looks. anyone tried pulling tube out and still have sound output? I`ve had car audio amplifier with 4 tubes installed just for looks pulling them out has no impact on sound whatsoever.
The 12AU7 is a dual triode tube.I suspect one triode acts as an input buffer per channel and the "Class A" mosfets handle the output drive.
Date published: 2013-07-01
ease of replacing the tube
People are mentioning replacing the tube will improve the sound. How easy or difficult is it to change out the tube?
This is a very simple process.(1)gently pull the tube straight out of top.(2)allign the pins of the replacement tube with the tube socket.(3)gently push the new tube in place, making sure you sure it is completely inserted. You can look through the side of the amp to make sure.If you have ever hooked up a s-video cable you will have no problem. You might also want to add some contact conditioner(Deoxit) to the new tube pins.
Date published: 2013-04-14
Since I know nothing of tubes, one thing I remember is that they often blew in the older type TV's and radios. How often do you need to replace them?
My step dad ran an appliance/electronic repair service from the mid 50s through the early 70s so I grew up around tube stuff. I remember that rectifier and other power tubes were the frequent culprits in failures. They worked hard, ran hot, and eventually failed. They could also be damaged by other components failing. Next were amplifier tubes but the failure rate wasn't near as high as others. TVs also generally ran longer than radios and both longer than audio gear.The thing to remember is that the circuitry that controls/converts the power from the wall plug to the various voltages & currents a device requires for its circuits aways work hard. Heat can be a killer, too and tube gear got hot. A lot of audio tube gear is a clssification of Class A. Class A does the most faithful job of reproducing an analog signal into a higher output signal. But, it is also the least efficient in that it takes a bunch of power, generates a bunch of heat, etc. Really, all an amplifier is is an adjustable output power supply.When any power circuit started to go, everything else will be affected. A lot of people used to play guessing games and replace tubes on a whim when their device began acting up. Eventually they'd replace the right tube. Maybe. I remember drug store having tube testers for people to bring in tubes from home and check them. Some even carried a few of the more common tubes.Hybrids, like this amp, use solid-state -transistors, chips, and the like- to handle the power creation chores. Those are much more stable as in they basically work or not and don't really get 'weak' like tubes can. They take heat better, too, although they are prone to many of the same types of failures as tubes were.In this amp the audio amplification is done by the tube which in a headphone amp shouldn't be taxed very hard. -WARNING- DO NOT touch tubes both because some will burn you and the oil from your skin can cause problems!) The tube should last ages if it's used correctly and treated nice. It's a fairly common tube often used for the same application so should you ever need one, which I doubt, it shouldn't be hard to find.If it develops a problem, you'll know. Just make sure it isn't your headphones, cord/plug, or hearing! (grins on the last one!)
Date published: 2014-01-03