I have no reason to believe the 862 published specs over anothers' Unless one has measured them both.
RF devices are often very linear as they cannot produce IM products that cause RFI issues and are mostly run class A. But they cant use pcb layouts that are not done with RF expertise.
As long as I have to build something rather than a machine, thru hole parts are my first choice. And, this is a DIY forum. If it wasnt, we would be talking about/assuming the smd all the time.
-RNMarsh
RF devices are often very linear as they cannot produce IM products that cause RFI issues and are mostly run class A. But they cant use pcb layouts that are not done with RF expertise.
As long as I have to build something rather than a machine, thru hole parts are my first choice. And, this is a DIY forum. If it wasnt, we would be talking about/assuming the smd all the time.
-RNMarsh
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You mentioned this before, why is this "leaded device" important? Are you soldering the production boards by yourself?
And for experimenting purposes, you can always get SMD-through hole adapters.
I had been told that they all dream to become the masters of the world. (wicked laugh)
Your welcome
Happy to help . From the data sheet there are 4 groups of current rating from about 10 to 40ma So please let us know what they shipped you .
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The Motorola part you asked me about was the MPQ6600,A. A quad bjt package of complimentary pairs. I used it for my first line stage of my 'diamond amplifier' configuration. Later on, published in TAA. Very low distortion. Mototrola doesnt make it any more, but I see On Semi and others still have it.... good to VHF (only)
-RNMarsh
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One feature of a properly conducted Blind Listening ABC Test as I've described, where each subject has 'unlimited' time to judge the 3 presentations is that EVERYONE hears differences ... whether scientist, true golden pinnae or pseudo Golden Pinnae.
But true golden pinnae will say something like "I think A & C are similar with C maybe a little brighter. I don't like B cos but can't explain why." The self declared pseudo Golden Pinnae will hear Chalk & Cheese differences even if all three presentations are the same item. You begin to distinguish between the Blind & the Deaf when you repeat the test.
I've never said the expected result of a Blind Listening Test is a NULL result. The truth is that SOME people under SOME conditions can hear amazingly small differences. Other people will claim they can hear tiny differences but are unable to demonstrate this unless each presentation is clearly labelled "evil 4558" or "$zillion" etc.
Who are you going to ask about whether evil 4558 sounds better than Blowtorch?
This is fundamental to my ABC Blind Tests. Our hypothetical
test is already flawed cos Blowtorch has to be a contender. But we may or may not put in the evil 4558. JC, in your zillion years as a High End designer, surely you know at least one person with true golden pinnae that you would trust to pick up the superlative qualities of Blowtorch vs evil 4558? Someone still alive ?
Why ?
Can't we assert that, or a difference is obvious, or it means we do not have to take care of ?
When two samples are so close that it needs a lot of concentration and time to ear any difference, only "maniac" audiophiles would try to distinguish from them a Grail from a Garbage, reasonnable people will give them the same note and only look at the price between them
Of course, the sources had to be carefully chosen to reveal different aspects, (Dynamic, details, ambiance, including non musical samples where no taste is involved, like life's ambiances and noises)
Now I would like to talk about the 'future' of amps and preamps. The latest issue (Jan'13) of Stereophile came this week and some new products were reviewed, that show the future we are working on in amp design. We are working with combinations of Class D and Class A to make relatively lightweight, powerful amplifiers. This is not an 'amateur' project, but it is the 'future' and what I have been working on with another couple of designers for the last few years. We showed the amp at Rocky Mountain audio a few years ago, and it has undergone constant revision since.
I listened to a Devialet D-Premier about 2 years ago. It combines a 5W class A with...a lot of class D. Not bad on digital inputs, however I didn't like the analog inputs (sampled at 48k only if I remember correctly)... but probably they fixed that since.
http://www.devialet.com/_DOWNLOAD/D-Premier-White-Paper.pdf
Power DACs = the future? On Wi-Fi input they eliminate CDPs, cables, preamps, again cables...
http://www.devialet.com/_DOWNLOAD/D-Premier-White-Paper.pdf
Power DACs = the future? On Wi-Fi input they eliminate CDPs, cables, preamps, again cables...
Looks like nothing is gonna save us from the future
. Wouldn't it be better to discuss this in a separate design thread, this one has been intended for highest quality linear design. I understand you have to make a living somehow, but this is too much regarding this thread.The desire to have "class a without the heath" is as old
as amplifier technology, I believe.
"new class a", "class aa", "optical class a", "dynamic bias"
"sustained plateau bias" ... etc. none of them did really live up
to their claims. We will see if this class d + a combination
does the trick. I´m sceptical. (there are no shortcuts to perfection).
as amplifier technology, I believe.
"new class a", "class aa", "optical class a", "dynamic bias"
"sustained plateau bias" ... etc. none of them did really live up
to their claims. We will see if this class d + a combination
does the trick. I´m sceptical. (there are no shortcuts to perfection).
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