[Balazska26]

 
Quote:

Get an RCA cleartop pulled from a conn and I'm sure you'll find the warmth
Like this one: http://cgi.benl.ebay.be/1-Tube-12AU7A-ECC82-CONN-RCA-Clear-Top-Tested-/160485871660?pt=Vintage_Electronics_R2&hash=item255db4102c
 
But for that one emissions are a bit off. Good ebay seller though

That's exactly the tube I've won

 

[Judge Buff]

Quote:

 
That's exactly the tube I've won

You may have some problems getting it to sound "balanced" if you can't manually adjust the bias on the cathodes.
 
BTW, while clear tops are awesome, God listens to these tubes.

 

[Balazska26]

 
Quote:

You may have some problems getting it to sound "balanced" if you can't manually adjust the bias on the cathodes.  
BTW, while clear tops are awesome, God listens to these tubes.

I have won a Black Plates tube as well

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160485872873&ssPageName=STRK:MEWNX:IT
This one

How to adjust the bias?!

 

[Ultrainferno]

You can't do that on a Bravo V2 like you can with the indeed version Judge has

 

[lazybum]

Hmm so there is absolutely no way to adjust the bias?
Ive just checked mine and it was biased at around 10v and 11v with the RCA grey plates that ive just received.
 
By the way i noticed there is a slight humming but it goes away when i touch the headphone out jack and hold my hand there. Is it a grounding issue or something and can it be fixed?

 

[Ultrainferno]

You can, just not as easy. check out thehelp from the guys at Rock Grotto:
 
http://rockgrotto.proboards.com/index.cgi?board=m&action=display&thread=5297
 
I hope you can solder and stuff 

 

[real128]

So I'm guessing no trim pots on the V2? That's quite an omission.

 

[Judge Buff]

Quote:

So I'm guessing no trim pots on the V2? That's quite an omission.

I agree... a $.01 resistor is a lot cheaper than a trim pot and since it works okay with probably 95% of the tubes in their inventory, there's no harm. That is until you start trying to roll tubes. Once again, I have to state that the Indeed G2 is the best one of these amps for rolling tubes. Every amp is limited in some way(s), but the V2 is definitely limited in getting the best out of each tube.
 
Fixed resistance is fine, if you can determine what the resistor's value needs to be to optimize your tube's performance. If not, tube rolling becomes a real roll of the dice.
 
With my Indeed, the optimum value seems to be around 13V, but there are tubes in my collection that I can't get to that value because their current draw is not sufficient to produce 13V at the max resistance of 2K on the trim pot. I can't imagine what they would sound like on the V2.
 

 

[Avro_Arrow]

Actually, the version that does not have the trim pot uses "Grid Leak" bias.
It is a kind of "automatic" biasing scheme. 

 
Quote:

So I'm guessing no trim pots on the V2? That's quite an omission.

 

[Judge Buff]

Quote:

Actually, the version that does not have the trim pot uses "Grid Leak" bias.
It is a kind of "automatic" biasing scheme. 
 

Can you explain how that works, A_A? As an old guy, I'm biased against any leaking...

BTW, congrats on the MOT designation!
 

 

[Avro_Arrow]

Thanks Judge Buff
 
Here is a link that can explain it much better than I can.
It's from the US Navy "NEETS" module.
You can go "back" to read about "cathode bias" and continue
"next" to read about "grid leak bias".
 
Quote:

Can you explain how that works, A_A? As an old guy, I'm biased against any leaking...

BTW, congrats on the MOT designation!
 

 

[Avro_Arrow]

Hey, I finally finished all the mods I wanted to do to my Bravo and I just had to share...
 

 

 

 

 

 

 
Here is a list of the mods...
 
Replaced IRF630 with IRF510.
Replaced 220 ohm gate stopper with 100 ohm.
Replaced crappy bias trim resistor with multi turn trim pot.
Replaced disc bypass cap with 1uF film cap.
Replaced output caps with 1000 uF Elna Silmic II.
Replaced power supply cap with 10000 uF Nichicon VR.
Replaced power switch with jumpers.
Add cathode bias bypass caps.
 
Any of the other mods I would like to do would involve etching a new board for it...
Hey wait, I could do that...

 

[pocketrocket]

I've got to say I love the black PCB on the Bravo. I wish they did Indeed in black, I wouldn't be so eager to put the metaphorical paper bag in the form of a tin box over it.

 

[Avro_Arrow]

All I can say is "Wow".
 
Did those last three part I put in ever change the character of this amp.
I had not done the three big electrolytics yet because I need to order
them. I had all the other parts laying around already.
All of the mods had improvements on their own but now that I have them
all done I can finally say this amps sounds really good. And I even still
have the stock tube....

 

[lazybum]

I like how the caps are almost as big as the tube

 
By the way I still have not solved my problem of a humming sound that goes away only when I touch the amp. I don't know much about electronics but after some searching a possible cause could be a ground loop?
I'd think connecting a wire attached to the amp to a ground would work, but at the moment i have no idea where to find a ground to connect to besides my body

Anyone can help?