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Can meaningful conclusions be drawn from internal pictures of amps and/or dacs? - Page 2

post #16 of 23

I can't see the full input stage of the Audio GD unit but these amps are more similar than not.  The Fostex uses opamp for the input and then fully discrete after that while the Audio GD appears to be fully discrete. 

post #17 of 23

I for one dislike when a manufacturer goes out of their way to disguise what parts they have used or do not publish internal pics or specifics of components used.  Red herring right there!

post #18 of 23
Quote:
Originally Posted by Mr.Sneis View Post

I for one dislike when a manufacturer goes out of their way to disguise...

I dislike it when manufacturers hide/lie about anything, not just parts that are used. redface.gif
post #19 of 23
Quote:
Originally Posted by wuwhere View Post

No EE or audio EE would even speculate. Software or firmware? Not even close.

 

Since you asked,

I spent a year designed Analog Signal processing gear so I guess I am qualified to "decline to comment".

 

I wouldn't want to look at a photo and speculate too much on the sound of an amp.

But I would not be impressed if the circuit used an LM741 Op Amp.

Even the sight of tubes does not guarantee a very "tubey" sound.

post #20 of 23

Well there is small issue that tubes don't have a sound.  redface.gif  The circuits they are used in sound this way but they would do that with a fet or a bjt as well. 

post #21 of 23
Quote:
Originally Posted by spritzer View Post

Well there is small issue that tubes don't have a sound.  redface.gif  The circuits they are used in sound this way but they would do that with a fet or a bjt as well. 

 

Well....................not really.................

 

The characteristics of tube THD is different than the spectra of JFET or BJT THD.

A single tube is more linear than a single BJT.

BTW, different types of transistors have slightly different distortion characteristics.

But no one would ever build an analog amp form a single transistor, they may build one from a single vacuum tube triode.

 

In addition, as you point out, the topology of a tube amp is normally quite different than the topology of an equivalent SS amp.

 

Complementary transistors are available, i.e. NPN and PNP type BJTs

Complementary tubes are not.

 

Read this:

http://api.viglink.com/api/click?format=go&key=04fea777994d26cd84e01a5e54f4c01d&loc=http%3A%2F%2Fwww.head-fi.org%2Fmessages%2Fmessages%2Fview%2Fid%2F2028424%2Fbox%2F537010&v=1&libid=1364920851947&out=http%3A%2F%2Fspectrum.ieee.org%2Fconsumer-electronics%2Faudiovideo%2Fthe-cool-sound-of-tubes%2F3%2Fdistortion&ref=http%3A%2F%2Fwww.head-fi.org%2Fmessages%2F&title=Private%20Message%3A%20Thoughts%20about%20valve%20'colouration'&txt=http%3A%2F%2Fspectrum.ieee.org%2Fconsumer-electronics%2Faudiovideo%2Fthe-cool-sound-of-tubes%2F3%2Fdistortion&jsonp=vglnk_jsonp_13649208612294

 

Difficult to draw a single solid conclusion.

 

Bottom line is...........IT DEPENDS.


Edited by Chris J - 4/2/13 at 9:41am
post #22 of 23

I did simply matters a bit too much as the different sand has different characteristics but the bottom line is down to how the tubes are used.  Electrostatics are a great way to showcase this as we can tap directly into the plates of the output tubes and show how the different setup sound and indeed measure. 

post #23 of 23
Quote:
Originally Posted by spritzer View Post

I did simply matters a bit too much as the different sand has different characteristics but the bottom line is down to how the tubes are used.  Electrostatics are a great way to showcase this as we can tap directly into the plates of the output tubes and show how the different setup sound and indeed measure. 

 

I ain't too sure where you're going with this?

Different tubes and different SS devices will have different THD specttra.

As will different topologies (circuit designs).

 

As you are aware, you can also use SS in different configurations.

Obviously, you can use tubes with and without transformers.

 

BTW, personally, I enjoy the sound of a good tube amp as much as I enjoy the sound of a good SS amp.

I'm not a tube or SS hater!  biggrin.gif

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