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Post by chloe on Apr 5, 2010 5:58:07 GMT
(THIS IS AN ADVERTISEMENT)So excited to find a new version of Bravo amp. It is relly a nice idea a headphone amp built with an EQ module. And I like the looking so much. Henry said it will be sold on Ebay soon, maybe in a few days or a few hours. 
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Post by attilio on Apr 5, 2010 7:53:46 GMT
Hope it sounds better than it looks,  Yes, grey and black plastic that's what was needed. Indeed  Attilio |
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Post by JohnnyBlue on Apr 5, 2010 12:06:37 GMT
Excited I am by exiting new developing, methinks a shill has crept upon RG...
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Post by attilio on Apr 5, 2010 12:26:45 GMT
you need a cold shower  Attilio |
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Post by PinkFloyd on Apr 5, 2010 12:43:06 GMT
Excited? I nearly creamed my pants when I saw this |
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Post by fidelity on Apr 5, 2010 14:01:28 GMT
I've always thought any kit with EQ = needed because it sounds crap!  |
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Post by chloe on Apr 5, 2010 19:24:12 GMT
More pictures:  looks so beautiful in dark  |
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Post by MaN227 on Apr 9, 2010 1:53:02 GMT
more details  ;D I think its an interesting Idea, why only 3 band I don't understand , but interesting all the same. reason being the first thing I thought of was the Frans filter maybe a slight ajustment on eq could help what needs help with individual cans. If you are trying to create interest, it takes details we all have pretty night light amps, some bravo's as a matter of fact. I will wait for details, can't dismiss it just yet, never know it may sound great. details, details, details just DO NOT tell me you have a great rock grotto intro price for the first 10 buyers , you can then count me OUT ! |
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Deleted
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Post by Deleted on Apr 9, 2010 6:52:08 GMT
I wish they would invest in using better quality parts (IRF510/530/LM317A/log volpot/better caps/35V type as PS cap) instead of putting a passive 3 band tone control in.
Hardly very 'high-end' IMO
Also it would be nice if they would publish REAL measurements.
this new one, acc to them, still has the same specs:
# Gain: 28dB
# Freq. response: 10Hz-60KHz +/- 0.25dB
# Signal/Noise Ratio: >90dB
These are blatent lies and are not even possible with a tone control in front as it would 'cost' at least 10 dB to get an effective tone control.
The bands and dB's of the tone control are not even mentioned.
@ Chaz, a passive tonecontrol with more then 3 bands is hard to build (perhaps 5 band would be maximum)
If I were to buy one I would opt for a 12AU7 type and modify it (other FET/LM317A/caps/switch) to get rid of the crosstalk too by using Oohms mod.
In this case it does not need a tone control anyway.
They did listen to some of the critics though.
a better powerswitch is installed (was needed too, the switch they used was not capable of handling the startup current of the PS capacitor).
Also the PCB is of better quality and double sided.
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Post by MaN227 on Apr 9, 2010 18:08:59 GMT
thanks for posting Frans active or passive not sure I understand the difference. the thing I was thinking about was hardware eq vs software eq. so maybe there is a reason it is the first? cause its not a good idea? if 10 db is lost with eq , how does that matter its still near 20 gain? playing devils advocate here ;D is this not the same bravo amp parts and a eq added on? well chloe ?  |
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Post by PinkFloyd on Apr 9, 2010 20:22:31 GMT
I actually LIKE the idea of tone controls on a headphone amp as long as they are properly implemented along with a tone defeat button.... Hell, I wouldn't mind a "loudness" button either for low level listening... nothing wrong with tailoring the "tone" to your own preferences, after all you will be the one listening to it.... I've had my fill of these bravo / indeed / miridy amps for the moment and UNTIL they start publishing true facts and figures I am steering clear. I am currently demoing a £69 portable amp which is blowing me away sonically (the Neco V2 portable) and it's time to move on from the glowing bottles to some SERIOUS good sound |
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Deleted
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Post by Deleted on Apr 9, 2010 20:56:36 GMT
thanks for posting Frans active or passive not sure I understand the difference. the thing I was thinking about was hardware eq vs software eq. so maybe there is a reason it is the first? cause its not a good idea? if 10 db is lost with eq , how does that matter its still near 20 gain? playing devils advocate here ;D is this not the same bravo amp parts and a eq added on? well chloe ? Chaz Now I am playing Devil's Advocate. Guess what voltage ratio 10dB is ?  Alex P.S. I will leave the rest to Frans . |
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Deleted
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Post by Deleted on Apr 10, 2010 11:10:42 GMT
What bothers me is that every Miridiy/Bravo/Indeed amp seller just 'copies' the 'technical datasheet' from one another and that they do so knowing that these figures are NOT the correct figures that go with these amps.  Some specs seem like they were once measured with IRF510 FET's in the early days before they decided to put in IRF630 because they were probably cheaper to get for them in large quantities ? What's even more disturbing is that the new version (with EQ) has the SAME specs. This is not even possible. ;D The amplification factor in itself is rather unimportant. everything between 4 times (= 12 dB) and 10 times (=20dB) is MORE then enough. 28dB is about 25x amplification. If the EQ in front of the amp has +/- 12dB range (determined by the fact that log pots are used in a passive tone control and the bandwiths of these tone controls are wide (as they are passive) the gain of the tube itself would be close to 100x (40 dB) Highly unlikely to say the least. More likely the gain WITHOUT EQ is 28dB and now is about 16 dB. This would be preferable over the 28dB. You will get more travel on the vol pot if they (again ?) used a lin. vol pot. Why can't they understand you ned log type pots for volume control ? There is a BIG difference in active and passive tone controls by the way. This involves bandwiths, Q-facors, number of bands e.t.c.  You can buy these amps if you like the looks of them and (need ?) tone control and/or the sound of these type of amps. Replacing the IRF630 to IRL530 is almost obligatory if you want them to sound 'brighter' (in other words more flat/faithful) Buying one of these amps based on the given specs is a foolish thing to do as the specs are NOT corresponding to the things they sell. Would you like to buy a car that in the brochure states it can run 180km/h and have good brakes and very good tires and steering/suspension so that you can safely cut through corners and have a nice ride and find out later that it can barely reach 100km/h has really bad breaks, no suspension and no steering reinforcement ? Of course if you drive both cars on a straight piece of asphalt at 50km/h you will never know... ;D |
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leo
Been here a while! 
Team wtf is it?
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Post by leo on Apr 10, 2010 16:15:31 GMT
specs are NOT corresponding to the things they sell. Thats not uncommon to see with majority of the cheap toys seen on epay I do agree with what you say Frans although you'll find a few folks neither read or care about specs |
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Post by MaN227 on Apr 10, 2010 16:32:47 GMT
where the F is chloe? anyway I still like the idea of the eq. I have a few portables, soon to be for sale that have similar via switches rather than slider and by George they DO make a difference as you can 'boost' highs, mids, or lows. I know nothing of technical issues. part of me wishes I knew more of it, the other part don't give a flying Phuckk. I put my trust in what others say here , then leave it up to my ears. and this of off topic, but the more I listen to the superlux 668B the more I like them. ok I shut up about that here I wont be buying one of these or any other amp for some time as I've spent too much lately on amps and can's. and there are many backpacking gear I'd LOVE to have. ;D .... but lol should something make its way down the pipe to the grotto that is an overwhelming hit with all, I could be swayed lol |
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Post by sueche on Nov 24, 2010 13:43:29 GMT
I've ordered one of these recently. Providing some photos:
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Post by sueche on Nov 24, 2010 13:44:20 GMT
As you can see I've already changed IRF630 with IRL510.
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Post by sueche on Nov 24, 2010 13:44:44 GMT
more...
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Post by sueche on Nov 24, 2010 13:45:06 GMT
more...
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Post by sueche on Nov 24, 2010 13:45:37 GMT
more...
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Post by sueche on Nov 24, 2010 13:46:03 GMT
It comes originally with EH6922, but I putted it into my AmpPuzzles for testing and going to try it with 6n23p-ev.
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Deleted
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Post by Deleted on Nov 24, 2010 16:30:47 GMT
It's the old bravo design + passive tone control.
With the original bravo both (c)heat sinks were on the outside of the PCB where air can pass it easily which is needed for the cooling action.
On this amp the right heatsink is in the middle of the PCB and the cover that is normally over it will prevent free air flow.
The right part of the amp will get considerably hotter in this case.
The schematic of the amp part = 100% first edition Bravo/indeed/Miridiy ... e.t.c.
The passive tone control is similar to the amppuzzles tone control (only this one has flashy LEDs too)
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Post by sueche on Nov 25, 2010 21:34:20 GMT
more pictures...
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Post by sueche on Nov 25, 2010 21:34:43 GMT
more pictures...
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Post by sueche on Nov 25, 2010 21:35:02 GMT
more pictures...
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Yes, grey and black plastic that's what was needed. Indeed 
;D
