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Bravo Audio V3 Discussion and Mods. - Page 3

post #31 of 42
Thread Starter 
Quote:
Originally Posted by miko16 View Post

Very nice and neat Didhefocus! Any plan of replacing better capacitors? Will there be a better improvement when you replace the stock capacitors with better one instead of rolling tubes?

 

Thanks miko16, No plan on changing Caps yet, I'm no expert at this stuff but I've been finding mods on various forums regarding the V1. I'm also new to rolling tubes but I have some 6DJ8 tubes on the way. I've already replaced the power MOSFETs from IRF630 to IRL530 which is supposed to extend the high end response. IRL510 is supposed to be even better, but I didn't find that out 'till after I ordered the IRL530s.


Edited by Didhefocus - 2/9/14 at 7:20pm
post #32 of 42
Thread Starter 

Sorry to change the name of the thread, but there was another one with the same name.

post #33 of 42
Thread Starter 

I didn't like the way I mounted the switch and I didn't  think I'll ever turn down the treble all the way so I mounted it in the bottom of the slot.

 

 

 

post #34 of 42
Thread Starter 

My Russian 6DJ8 tubes arrived today, much earlier than expected.

They sound is as good or maybe even better than the 6922. The tube is now centered in the cutout hole better also.

post #35 of 42

Sorry to bump an semi-old thread, but I love my V3.  So far no mods yet, but the IRL510's are on the way.

I did add one 1.5" micro brushless DC fan for cooling the mosfets and LM-317's. Running at 4.5 volts, it's perfectly quiet and does not add any noise in the amp.

 

Also purchased a better 24v switching supply for $18 (with free shipping) from the-bay, and it's noticably quieter - no hum or noises with no input and CD player switched off.  24-volts DC at 3-amps with output voltage adjustment available, couldn't be happier.  Quiet and runs cool as a cucumber, so very happy there too.

post #36 of 42
Thread Starter 
Quote:
Originally Posted by af0h View Post
 

Sorry to bump an semi-old thread, but I love my V3.  So far no mods yet, but the IRL510's are on the way.

I did add one 1.5" micro brushless DC fan for cooling the mosfets and LM-317's. Running at 4.5 volts, it's perfectly quiet and does not add any noise in the amp.

 

Also purchased a better 24v switching supply for $18 (with free shipping) from the-bay, and it's noticably quieter - no hum or noises with no input and CD player switched off.  24-volts DC at 3-amps with output voltage adjustment available, couldn't be happier.  Quiet and runs cool as a cucumber, so very happy there too.

I'm glad you did. I've been meaning to post some updates myself. Got another similar amp in the meantime, a Little Bear P1 which is a clone of the Indeed G2. I believe the Indeed amps (G1) especially, are what the Bravos are based on. I did the same mods to both, IRL510 mosfets, caps across the bias pots, etc. I'm surprised you found the Bravo's power supply noisy, mine was pretty quiet. The Little Bear's on the other hand was terrible. I immediately got a better one for it on ebay just as you did, 24vdc/2a and silent! I'll get more in-depth when I have more time.

post #37 of 42
Quote:
Originally Posted by Didhefocus View Post
 

I'm surprised you found the Bravo's power supply noisy, mine was pretty quiet.

It wasn't very bad, but any power supply noise is bad noise.  Mostly it was a low-level hum.

Of course the gain had to be turned way up (with no music coming through) to hear it, but it was there.

 

Now I need to add resistors to the volume circuit to increase my useable volume range (can't get up to 1/4 vol)

or replace the vol pot with a log type.  Of course I'm using Pioneer SE-A1000's, and they're pretty efficient (and low ohm).

post #38 of 42

Hello guys I bought a v3 last month and today I tried to set the bias.

However on one side the range went from -15.0V to -16.0V and on the other side it was -13.0V to -16.6V.

After adjusting both sides to 15.5

The right output cut out completely and the volume stopped being any sort of effective

(where I used to listen at the 2/10 point now I had to go to the 8/10 point for the same volume).

When I went back to check the voltage both sides were suddenly showing -19.8V and the pots were having no effect.

Did I ruin the amp? what should I do?

post #39 of 42
Thread Starter 
Quote:
Originally Posted by swiftblade13 View Post
 

Hello guys I bought a v3 last month and today I tried to set the bias.

However on one side the range went from -15.0V to -16.0V and on the other side it was -13.0V to -16.6V.

After adjusting both sides to 15.5

The right output cut out completely and the volume stopped being any sort of effective

(where I used to listen at the 2/10 point now I had to go to the 8/10 point for the same volume).

When I went back to check the voltage both sides were suddenly showing -19.8V and the pots were having no effect.

Did I ruin the amp? what should I do?

Hi and welcome. Sorry to hear about your problem with your new Bravo. From the info you gave us...I would guess the tube is bad. Knowing that you just got your V3, you may not already have another tube to try. Does the place you bought it from have any return policy or warranty relationship with Bravo? I read your post earlier and noticed it mentioned a website  where you purchased it. The moderator must have removed it. My V3 was very badly assembled with loose screws in the LM317 transistor heatsinks and NO thermal grease. luckily I noticed this almost right away. If I were you I'd check all the heatsinks before your try using it again. Let us know what you find or decide to do.

Good luck!


Edited by Didhefocus - 4/23/14 at 7:23pm
post #40 of 42

thank you... When I was adjusting the pots there was a spark and a smell of ozone off the pots, could it be that the pot's went? would replacing them help? if yes what would I replace them with?

post #41 of 42
Thread Starter 
It's unlikely that both pots went bad at the same time but stranger things have happened. You could use your meter to check them. If you remember exactly what component you touched with the screwdriver, it would help. You should use only non metallic pot adjusting tools to prevent future sparks!
post #42 of 42

the components touched were the pots that's where the ozone and spark came from then I've accidentally touched the contacts on both pots non of the other components show any sign of damage

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