Mr Pass where are you

[mastertech]

I am a passlabs class-a FANATIC!!!!!!!!!!

wHERE has Mr Pass gone lately, i have a few more questions
to ask him

Mr Pass is CLASS-A the undisputed class of operation for
audio fidelity, and if yes,what are the technical reasons for it

Mr Pass is CLASS-A singleended the undisputed CLASS-A circuit
topology for more distortion, and if yes, what are the technical
reasons for it

i await your awesome reply
The two and only

[Nelson Pass]

I don't know about undisputed, but I certainly favor
Class A operation as the most linear and giving the
best performance with simple circuits and little or no
negative feedback.

Single-ended Class A takes it a step further in simplicity,
and gives a 2nd harmonic distortion instead of the 3rd
harmonic of push-pull circuits. Some prefer that, some don't.

Another thing I like to do is balance two SE circuits, which
yields a 3rd harmonic, but has a little different character
than the usual push-pull approach.

The down side of these circuits is that they have low efficiency,
and are best suited to smaller amplifiers. On the other hand,
they are easy to do for DIYers because it is easy to get good
sounding results from a simple amplifier.

[GRollins]

Hmmm...
That's the kind of post that requires a book to answer in any detail.
The short answer is that class A is indeed the best, albeit at the cost of higher heat dissipation. All things considered, it is also more expensive.
Single-ended is more open to question. There are times when it's the best answer, and times when a push-pull design is better.
Considering that your questions have been thrashed to death in other threads, you might want to use the search function to locate a couple of them rather than go through it all again.

Grey

[mastertech]

Mr pass i cant believe with all the experience you have, you have not conclusion
as to what class is best,Mr pass audio fidelity is we talk about not comercial
amplifier harmonic distortion liking

Mr Pass is there a difference between a single ended with current source
and another with a passive load and if yes give reasons why a current source
is better ,because of the psrr?,etc....

[mastertech]

GRollins:
The short answer is that class A is indeed the best, albeit at the cost of higher heat dissipation. All things considered, it is also more expensive.
Single-ended is more open to question. There are times when it's the best answer, and times when a push-pull design is better.
---------------------------------------------------------
why is the best?,is that all you have to say,or you need to quote a whole book
you can summarise if you know your stuff sir....

second part

open to question?,again!!!!! you say NOTHING -THIS IS A TECHNICAL FORUM--
THERE TIMES THIS TIMES THAT ETC

tthird part
"Considering that your questions have been thrashed to death in other threads, you might want to use the search function to locate a couple of them rather than go through it all again."
this is my thread, i have more questions to ask, if mr pass doesnt mind of course
i can go through what i like!!!thanks for your suggestion

I THANK YOU FOR YOUR CONTRIBUTION ANYWAY

i am a class-a FANATIC!!!!!!!!
i am a passlabs FANATIC!!!!!!
i am a diyaudio FANATIC!!!!!!!!!

[BobEllis]

Originally posted by mastertech
...you say NOTHING -THIS IS A TECHNICAL FORUM--...

Considering how much both Mr. Pass and Mr. Rollins have contributed to this forum, that is rather harsh and in poor taste.

Yes we have a technical forum, but the final arbiter of "the best" is the end user in his or her own system. (Not intending to start an objectivist/subjectivist debate) Any engineered product involves tradeoffs. For me, heavily biased class AB push-pull is "better" than class A on the basis of efficiency in my small listening space. Others may disagree, that is one of the things that makes this hobby interesting. Many routes to the same goal.

Mr. Pass gave you some technical reasons for his preference, and in his articles and many posts here, he does an excellent job of explaining the technical benefits of each choice for the particular application. Look at his choices to power each driver in the Rushmore and you'll have to conclude that there is no single best choice for all applications.

Mr. Rollins pointed you to further reading on the topic, and gave you points to ponder. This is DIY audio, not ask and be spoon fed. He does not deserve your dismissal.

A quick look at your web page makes me think you were really asking for advertising copy and/or an unwitting endorsement. I hope that is not so, but that was the thought that crossed my mind.

Since you claim to be an expert there, why do you need Mr. Pass to explain it to you? Go build a Zen, an Aleph, a DOZ, a JLH or any one of the numerous class A designs out there and decide for yourself what is best FOR YOU - there are plenty of people who will tell you that this one or that one is the ultimate. Can they all be wrong? Can they all be right?

[homer09]

What are u trying to achieve with this thread mastertech? On your site you claim to have figured out all the advantages and the right "philosophy" for sound reproduction. SO why are u harrassing Mr. Pass and others by pretending your new to this? Either you are lying on your site, or you are lying on this thread.

Figure it out, or dont post again. there is enough thread pollution on this forum.

[mpmarino]

Considering how much both Mr. Pass and Mr. Rollins have contributed to this forum, that is rather harsh and in poor taste.

I've learned a lot from these guys.....
Stumbling upon this forum and it's wealth has given me a dream hobby. It's like learning guitar from Clapton.

thanks again fellas!

[GRollins]

From mastertech's website:

# The Leader in audio Fidelity
# Highly Engineered Equipment
# Highest Quality Assembly
# Power mosfet super linearisation

The Leader? (er...did I miss something?)

mastertech,
Even making allowances for variations in English language useage around the world, it would help if you got someone to proofread your site. The white papers could use a little touch-up as well. While you're at it, you might tone down the hyperbole and double check a few facts.
For instance, although I am pretty squarely in the analog camp (call me a dinosaur if you like, but hey, I like dinosaurs...) I wouldn't be so rash as to predict that digital formats will fail. Such pronouncements are at least twenty years too late, and inaccurate at that.
I admit to a certain degree of amusement in seeing a web page purporting to sell class A MOSFET amplifiers...but on tagging the link for "Product" I got a notice that the page was unavailable. Thankfully, the "Order" link produced a similar result. In both cases I was rewarded with the picture of what appeared to be a plastic monkey along with the error message. I'm sure it was unintended, but it did make me laugh.
If I were in the market to buy a pig-in-a-poke amplifier, I would be somewhat less amused by the Chief Cook and Bottlewasher's refusal to identify himself by name. Any reputable company is staffed by real people who are proud of their product and identify themselves unambiguously. It inspires confidence in the product. Someone who hides behind a coy nom du web on what appears to be a commercial site might lead one to wonder what they had to hide.
Sigh...
Bob's point about class AB being better for him due to efficiency concerns is a valid one. There are lots of people who find that to be a good tradeoff. I still use my older Thresholds, even though they're class AB. My tube amps are AB also, although I assembled a variant that was class A and ran it for a month or two; marvelous sound, but not enough power for me, since my speakers are only of moderate efficiency.
I just finished reading an article about Burt Rutan and SpaceShipOne. I'd love to own my own rocket. It would be a really nifty way to get to work. However, it's not exactly what you'd call practical, so I have not embarked on a DIY rocket (yet). Class A amplification is a somewhat more reasonable proposition for me. I can have something that is cutting edge without having to drop a few million dollars in R&D funds. It may not get me to work, but it's still fun to play with.
mastertech, while it's noble that you are a class A, Pass Labs, DIY, rootin' tootin' FANATIC, I suggest that you develop at least a passing interest in manners. Not that you have to be a fanatic, mind you, but it might help a bit.

Grey

[homer09]

oh and nice touch ripping off the diyaudio logo