Burning Amp BA-3

[2 picoDumbs]

I have only biased to just a hair under 1

I read this.
You didn't specify volts or amps.
I usually quote bias in amps.
I built one channel of a BBA3 many years ago, just running on lab power supply still not complete.
I don't need to read the build guide, just need to look at the circuit. I've certainly read every article by Papa many times over.
I'm just curious about your experience. That's it.

 

[Russellc]

I read this.
You didn't specify volts or amps.
I usually quote bias in amps.
I built one channel of a BBA3 many years ago, just running on lab power supply still not complete.
I don't need to read the build guide, just need to look at the circuit. I've certainly read every article by Papa many times over.
I'm just curious about your experience. That's it.

The poster, who I responded to, knew exactly what I meant. That's who I wrote it to, no need to concern about my experience!

Russellc

 

[2 picoDumbs]

The poster, who I responded to, knew exactly what I meant. That's who I wrote it to, no need to concern about my experience!

Russellc

Lmao.
Ok mate I will put you on my ignore list right now.
Thanks for letting me know.

 

[jacco vermeulen]

lemon <-> truck. truck<-> lemon

(coming to you live from the comic relief front)

 

[2 picoDumbs]

 

[JCP]

I'm confused; I've been pretty determined to build a single ended BA3, but maybe I want more power; maybe a complimentary with double output boards would do the trick...?

So,- the real question is actually if a 4U/400mm chassis will provide sufficient cooling for a complimentary with double output boards, or should I aim for a 5U/400mm?

 

[6L6]

Double boards? 5U. No question.

 

[JCP]

Thanks a lot, then 5U it is

What power might a double mono, double output bord BA with 32V rails produce?

 

[6L6]

Balanced 100+ WPC
Standard, 40 WPC

 

[JCP]

Thanks again

Going for standard and 40Wpc, what is optimum VA on the transformers?


Jørgen

 

[AndrewT]

For standard ClassA the transformer VA is usually around 6 to 10times the maximum ClassA power.
So 40W of ClassA would require 240VA to 400VA.

Does Pass give guidance in their website?

 

[JCP]

I'm pretty sure I've read something about it somewhere, but I can't recall where exactly. 240VA to 400VA makes it possible to save both money and weight; I was concidering 2x600VA. Overkill isn't always the way to go, but I believe I'll be able to stuff a 5U/400 chassis quite well

Thanks a lot!

Jørgen

 

[Russellc]

I'm pretty sure I've read something about it somewhere, but I can't recall where exactly. 240VA to 400VA makes it possible to save both money and weight; I was concidering 2x600VA. Overkill isn't always the way to go, but I believe I'll be able to stuff a 5U/400 chassis quite well

Thanks a lot!

Jørgen

I used a 24 volt 1000VA SUMR for 32 volt rails, but only because I had it from a Turbo F-5 group buy. It is overkill and it is heavy. I forgot to upgrade the 25 volt 1000uF caps on the BA-3 board, they took it, but I did change them out for higher voltage spec caps to be safe.... Enjoy your build, I know I did!

Russellc

 

[MASantos]

A question for the more knowledgeable guys:

I am considering building a dual mono BA3 balanced in a 5U big chassis case, with one channel per side. Is it better to have 32v rails and lower bias or 24v rails and higher bias? Has anyone ever made this experience?

 

[AndrewT]

It depends on what load you attach and what level of ClassA you aim for into that attached load.
We can't guess.

 

[MASantos]

It depends on what load you attach and what level of ClassA you aim for into that attached load.
We can't guess.

I understand the math behind it, I was looking for listening impressions.

 

[2 picoDumbs]

A question for the more knowledgeable guys:

I am considering building a dual mono BA3 balanced in a 5U big chassis case, with one channel per side. Is it better to have 32v rails and lower bias or 24v rails and higher bias? Has anyone ever made this experience?

That would depend on the impedance and sensitivity of your speakers and how loud you listen to music.
On a push pull circuit I'd lean towards more voltage, on a single ended circuit more bias current but that's just my general rule of thumb

 

[AndrewT]

A question for the more knowledgeable guys:

I am considering building a dual mono BA3 balanced in a 5U big chassis case, with one channel per side. Is it better to have 32v rails and lower bias or 24v rails and higher bias? Has anyone ever made this experience?

I understand the math behind it, I was looking for listening impressions.

Are you seriously expecting some other Members to build both versions for you so that your can hear their subjective opinion on the perceived audible differences?

 

[MASantos]

No I don't expect that and I did not make such request!

If you read my post until the end I asked if someone had already made such experiment.

Has anyone ever made this experience?

 

[AndrewT]

Is it better to have 32v rails and lower bias or 24v rails and higher bias?

= build both and compare for you !