High-End Regulated Buffered Inverted GC

[pinkmouse]

Ok, everyone is getting a little heated here, and the thread is currently going nowhere. Please think before you post, and if you have nothing positive to say, then don't post.

Thank you

[analog_sa]

Note: Peter can't get an OPA627 sounding as it should, and I knew that from the begining.

Who other than yourself can believe this statement? Is it really rocket science to wire 2 resistors and a couple of decoupling caps?

Are you really unable to accept that personal preferences differ and the 627 may not be to everyone's liking?

[ble0t]

I think everyone should take a look at this and just calm down a bit...it's only audio

Bit-Tech Article

[tbla]

.....ok - ready for the finals......i spent a couple of hours making a superb lasagne....and i have a few good barberas......i'm ready to regulate........may the best win!!!!!!!!!!!!!!!!!!

[moving_electron]

I would like to understand what components people are using and any impressions of preference.

It sounds like most of the great sound is coming from circuit design and circuit layout but I seem to recall that as Carlos was doing his final iterations of cap value etc. he was also changing from a "whatever" quality cap to a "good quality cap". I am paraphrasing here because I am doing this from memory. So Carlos expected to get some benefit from going to the part quality level he did. I am not sure exactly what level that is or his preferences.

Sounds like folks have not used "exotic" quality components and have gotten very satisfying implementations they are enthusiastic about.

So my question is for those that have implemented the Regulated Buffered Inverted GC: what component types are you recommending? How much difference if any did you experience over generic "whatever" components? I am thinking about the caps, resistors etc. because the regulators have been discussed to some extent.

[fmak]

Note: Peter can't get an OPA627 sounding as it should, and I knew that from the begining.

If this thread continues this way, I'll stop posting, I have no life for this.
Thank you.
Good bye. [/B][/QUOTE]
------------------------------------------------------------------------------------
I think you shoud STOP being offensive to others, especially Peter. I may not agree with him but I do read what he asserts.

Your own GC schematic is not anything to shout about. The coupling caps introduce their own sound, as does the OPA627.

There are plenty of people who like the 627 and others who don't ; regardless of decoupling.

One of the most effective decoupling techniques is to use an expesive NPO 0.1uF between V+ and V-. Tames the LM6172 perfectly. There are plenty of posts on this issue and you are just one of many who have found differences.

[HDTVman]

You know, what we have here are two people of strong opinion and the other people that line up behind anyone that takes a stand. We do have a few free thinkers too and most of us are laughing at the rest.

Neither one of our heros can back down and lose face so we can forget about that.

Now, lets see what we really have to look at here.

The idea is placed before us that using regulators to power the National high power chip amps is a good idea. OK, nothing is wrong with that so far. Some people disagree but the ones that do only build cook book circuits and if it's not in there favorite cook book they don't understand and that's OK too.

Different part values are talked about to go with the regulators. OK, that's fine because different types of regulators have there own optimum designs just like amplifiers do. Some people like chip regulators, others like myself build discreet circuits. No problem there, at least not for me.

Somewhere along the line the words BEST are spoken out loud. Oh My God! We are in for it now. The trashing begins.

What most of the posters forget is that our heros in this drama used there own systems to "tune" there amps.

I do not believe for one second that one of these amps is the best in all systems.

I will say that the regulated design will be more stable into difficult loads and it will drive power hungry speakers better. For these two reasons I think more people will get better performance from an amp. with a regulated power supply. I exclude battery powered designs because almost no one will build and live with one of these long term.

Do the buffers make a difference? I don't know because I haven't gone that far down the line yet. I can see where it could, but to fight over which opamp chip to buffer with goes right back to SYSTEM TUNING.

I system tune just like everyone else does. The difference is I know that it's happening and say so. No one size fits all so step back, take 3 deep breaths, admitt to yourself you could be in error about some things, and DROP THE ATTITUDES.

later BZ

[planet10]

Originally posted by Nuuk
so may I respectfully request that the moderators move anything arising from this post to a new thread where it can be discussed without further 'spoiling' the topic of the regulated buffered IGC?

We are already working on it....some posts have been moved, but it means someone taking an hour or more to go thru all the posts...

dave

[peranders]

What is high-end?

Can a LM3875 based amp ever be high-end?

What is the criteria for high-end?

Who puts the high-end label on an amp?

Is OPA627 high-end?

What are you talking about? Lost track long time ago.

This is starting to sound like Jocko's 29 Commandments!

[HDTVman]

Originally posted by peranders
What is high-end?

Can a LM3875 based amp ever be high-end?

What is the criteria for high-end?

Who puts the high-end label on an amp?

Is OPA627 high-end?

What are you talking about? Lost track long time ago.

This is starting to sound like Jocko's 29 Commandments!

YA, what he said!

Oh, and yes I have. What he said too.

BZ