John Curl's Blowtorch preamplifier

Status
Not open for further replies.
john curl said:
I am only suggesting a 'level playing field'. The 'rocks' should not just be thrown at us, PMA. It makes people think twice, when the 'rocks' can be thrown back with the same advantage.

John why do you feel so persecuted? No-one out here as far as I can tell is trying to throw rocks at PMA, you, or anyone else. Asking for back up to what is postulated is not throwing rocks it is just normal scientific practice and engineering good practice. PMA presented a couple of graphs that were missing out on experimental detail and detail was asked for. Why on earth you need to react so paranoid is beyond me. Additionally you usually throw 30 year old rocks [in your repeated references to "what you did 30 years ago"] and then suggest someone else has thrown them [in your repeated use of referring to others to back up what you say].
 
john curl said:
The plots are 'self-explanatory', PMA.


Here's another self-explanatory plot for you, John.

Enjoy!

Jan Didden
 

Attachments

  • rgp.jpg
    rgp.jpg
    95 KB · Views: 420
bear said:




Perhaps this is your big opportunity to try some <gasp> different interconnects going to that headphone amp? Different sources? <gasp>

How about getting some good headphones like some top of the line STAX ESLs?
Imagine how "bad" everything would sound then?? :hot:


_-_-bear

😀


They were a gift, I tend not to indulge on such things especially since I don't particularly like headphone listening. Other people on this forum put then on a short list of favorites certainly citeing them as capable of "easily" telling 16/44.1 from 24/96. If I swap 3.5mm to 1/4" adaptors I can't tell the difference between any of them including a 25yr old Radio Shack unplated one. I'm sure some one sells a $125 one as well as a $1000 1 meter interconnect for my little amp. All my interconnects are DIY BTW, I have a 1000' spool of Belden shielded twisted pair. It just keeps on going.
 
scott wurcer said:


No please don't misquote me, I agree with Pease DA can be modeled almost completely with a bunch of RC networks completely linear and time invariant. There is no DA distortion.


This is also my understanding of DA.

If the DA distortion is then linear, I would think that it would show up as a frequency/phase response alteration. That should be readily measurable.

I'm not convinced that DA is at the root of capacitor sound. I don't think it is the cause, but there is a chance that there is something else different about capacitors (that is less measurable/understood) that may be correlated with DA.

It has also been my experience that DA measurements of the same type, value and voltage rating of two caps, one off-shelf and one expensive boutique, are virtually identical.

Cheers,
Bob
 
Bob and Scott, you confuse the MODEL with reality. There are NO resistors in series with tiny caps inside the capacitor. The real mechanism is electromechanical, and I doubt that it can be PERFECTLY linear. Mostly linear, for sure.
Besides, regarding the DA mechanism in audio it is NOT NON-LINEARITY of DA that we normally consider, but the error created by the DA, which is mostly a linear error, but an error, none-the-less. I suspect, that in many cases, where a capacitor is measured ONLY for non-linearity, we are seeing the effect of the same mechanism that creates DA, but only through a non-appropriate test for the most part, to detect DA
I mean really, isn't 1% DA or -40, more obvious to being important than -160, being the same distortion as measured by 3'rd harmonic testing?. That is an example of 1 million to 1 ratio in the amount of error, e.g. linear error to nonlinear error. They are both errors from the ideal signal path.
 
Status
Not open for further replies.