<p dir="ltr">My guesses are:<br>
1. Many people know op amps better than an equivalent sort of circuit with transistors etc and so stick to them<br>
2. It's easier to use a ready building block than to design your own<br>
3. End users want to use a different character part in an existing product, or manufacturers want to do the same when producing simple clones</p>
<br><div class="gmail_quote"><div dir="ltr">On Mon, 1 May 2017 14:01 David Moylan, <<a href="mailto:dave@westphila.net">dave@westphila.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I agree with the BS comment. I doubt the gain "per stage" is lower.<br>
With current source loading etc. gains per stage can be very high. I<br>
think most off the shelf opamps would beat these discrete opamps in<br>
measured specs for what opamps are supposed to be. The most obvious<br>
characteristic is massive open loop gain (which usually gets assumed to<br>
be infinite in the equations).<br>
<br>
Where typical IC opamps may _potentially_ be inferior for audio is most<br>
likely in the type of distortion and the transition from clean to<br>
overdrive. The discretes will probably have more baseline distortion.<br>
That alone might make listeners like them (dependent on the level). I<br>
would expect they would have lower open loop gain, softer transition to<br>
overdrive, require less feedback for equivalent gain, etc.<br>
<br>
The whole thing is very similar to the tube/transistor debate. I think<br>
results would be very dependent on the circuit around the opamps and I<br>
don't think the claims should be taken at face value. I'm a firm<br>
believer that the only valid tests are double blind listening tests. Do<br>
you think you could tell the difference in the same circuit?<br>
<br>
To me, if you don't like the massive gain plus feedback topology that<br>
opamps require why not just design discrete stages to provide gain/drive<br>
you need?<br>
<br>
<br>
On 04/30/2017 01:06 PM, cheater00 cheater00 wrote:<br>
> Every load of bullshit starts as truth that gets twisted and facsimiled.<br>
> So let's pick out what might be true.<br>
><br>
> He says that the single transistors in a monolithic IC op amp can<br>
> dissipate much less, so their gain is lower, and therefore there must be<br>
> many more stages. Can this be true?<br>
><br>
> My guess is also that control (feedback) topology ends up being much<br>
> more complicated, resulting in less pleasant edge cases (ie what happens<br>
> when the op amp reaches an unusual or extreme state). Is feedback<br>
> topology a large issue in op amps like it is in amplifier circuits? Does<br>
> using more stages make this problem bigger?<br>
><br>
><br>
> On Thu, 20 Apr 2017 20:47 Mike HEQX, <<a href="mailto:mike@heqx.com" target="_blank">mike@heqx.com</a><br>
> <mailto:<a href="mailto:mike@heqx.com" target="_blank">mike@heqx.com</a>>> wrote:<br>
><br>
> <a href="https://www.youtube.com/watch?v=nZqmbo9CGO0" rel="noreferrer" target="_blank">https://www.youtube.com/watch?v=nZqmbo9CGO0</a><br>
><br>
> And this is the other character that Orange has teamed up with to<br>
> market their products.<br>
><br>
><br>
> On 4/20/2017 11:32 AM, Justin Herrmann wrote:<br>
>> "Top notch, you know..."<br>
>><br>
>> That's all the convincing I need!<br>
>><br>
>> Seems legit.<br>
>> On 04/20/2017, 10:16 AM Quincas Moreira <<a href="mailto:quincas@gmail.com" target="_blank">quincas@gmail.com</a>><br>
>> <mailto:<a href="mailto:quincas@gmail.com" target="_blank">quincas@gmail.com</a>> wrote:<br>
>><br>
>> oops, wrong link! i meant<br>
>> this <a href="https://www.youtube.com/watch?v=tKanR1aM16I" rel="noreferrer" target="_blank">https://www.youtube.com/watch?v=tKanR1aM16I</a><br>
>><br>
>> Sent from my iPad<br>
>><br>
>> On Apr 20, 2017, at 9:21 AM, Elain Klopke<br>
>> <<a href="mailto:functionofform@gmail.com" target="_blank">functionofform@gmail.com</a> <mailto:<a href="mailto:functionofform@gmail.com" target="_blank">functionofform@gmail.com</a>>><br>
>> wrote:<br>
>><br>
>> So... Quincas... you're selling the Tsunami module for $43<br>
>> a pop? ;P<br>
>><br>
>> On Thu, Apr 20, 2017 at 9:07 AM, Quincas Moreira<br>
>> <<a href="mailto:quincas@gmail.com" target="_blank">quincas@gmail.com</a> <mailto:<a href="mailto:quincas@gmail.com" target="_blank">quincas@gmail.com</a>>> wrote:<br>
>><br>
>> this showed up on youtube today... Orange amps guy<br>
>> selling snakeoil for 43 bucks a pop...<br>
>> <a href="https://youtu.be/wulg6GZj6oE" rel="noreferrer" target="_blank">https://youtu.be/wulg6GZj6oE</a><br>
>><br>
>> Sent from my iPad<br>
>><br>
>> On Apr 13, 2017, at 8:56 AM, Phillip Harbison<br>
>> <<a href="mailto:alvitar@xavax.com" target="_blank">alvitar@xavax.com</a> <mailto:<a href="mailto:alvitar@xavax.com" target="_blank">alvitar@xavax.com</a>>> wrote:<br>
>><br>
>> Quincas Moreira wrote:<br>
>><br>
>> I like them, I cannot lie<br>
>><br>
>> > There's a big BUT however:<br>
>><br>
>><br>
>> I can't deny. ;)<br>
>><br>
>> --<br>
>> Phil Harbison<br>
>><br>
>><br>
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