[Synthax]

Does BHA-1 use negative/global feedback in its circuit?

 

[Hubert481]

http://bryston.com/pages/warranty.html

Is there 5 or 20 years of warranty for the BHA-1 ?

 

[Chris J]

Does BHA-1 use negative/global feedback in its circuit?

Yes.

Only audiophiles think negative global feedback is a bad thing!

 

[Chris J]

http://bryston.com/pages/warranty.html

Is there 5 or 20 years of warranty for the BHA-1 ?

Twenty year warranty.
The headphone amplifier is not a digital product.

 

[Hubert481]

Thx

 

[Synthax]

Probably you are right, but I'd like to hear different approaches of producers. I have fun with that, and I do not proclaim that feedback is back. 

 

[Trance_Gott]

James, Mike from Bryston please answer one question:
Why did you design the BHA1 not fully balanced? I have a balanced input with V800 DAC but from my understanding every input of the BHA1 is converted to Single Ended. So a balanced input has no benefit. Make this sense? Thanks

 

[Rob80b]

James, Mike from Bryston please answer one question:
Why did you design the BHA1 not fully balanced? I have a balanced input with V800 DAC but from my understanding every input of the BHA1 is converted to Single Ended. So a balanced input has no benefit. Make this sense? Thanks

?

http://bryston.com/PDF/Manuals/300028%5BBHA1%5D.pdf  Page 10

 

[Chris J]

James, Mike from Bryston please answer one question:
Why did you design the BHA1 not fully balanced? I have a balanced input with V800 DAC but from my understanding every input of the BHA1 is converted to Single Ended. So a balanced input has no benefit. Make this sense? Thanks

I know I'm not James, but the balanced input stage rejects Common Mode noise.
That's what it is supposed to do.
That is the purpose of running balanced transmission lines from your source to your amplifier.
So Common Mode noise is rejected before it is amplified.
Then the output stage converts the signal back into balanced via two bridged amplifiers.

I don't see any technical advantage to running "fully balanced".

 

[Rob80b]

I know I'm not James, but the balanced input stage rejects Common Mode noise.
That's what it is supposed to do.
 

I'm not James either but also from far as I can tell the amp has discrete +, - , and ground from input to output.

 

[Chris J]

I'm not James either but also from far as I can tell the amp has discrete +, - , and ground from input to output.

It strikes as odd that an amplifier that accepts Single Ended and Balanced inputs, can drive either Single Ended or Balanced headphones, and has a differential (balanced) input stage to reject common mode noise from balanced transmission lines is perceived as flawed?
Wah?

 

[R-Audiohead]

It strikes as odd that an amplifier that accepts Single Ended and Balanced inputs, can drive either Single Ended or Balanced headphones, and has a differential (balanced) input stage to reject common mode noise from balanced transmission lines is perceived as flawed?
Wah?

This might be the most outstanding feature of the amp--
 
Different strokes I guess...

 

[Trance_Gott]

I would like an official answer from James and Mike. I think converting from Balanced to Single Ended is not a good idea.

 

[Chris J]

I would like an official answer from James and Mike. I think converting from Balanced to Single Ended is not a good idea.

Why do you think converting from Balanced to Single Ended is a bad idea?
A balanced input stage rejects noise, then it amplifes the signal in single ended mode.
What's the problem?
Your statement has no basis in fact.

 

[Trance_Gott]

In fact single ended has no separated ground! So first I have the advantage of balanced (V800 DAC) with reject noise. But then this is converted to single ended with no seperated ground and sensitive for noise. You think that is no problem? Why there are full balanced layouts like GS-X or HDV600 on the market?