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-   -   Who can tell me anything about this unusual amplifier (http://www.diyaudio.com/forums/solid-state/176652-who-can-tell-me-anything-about-unusual-amplifier.html)

ati 4th November 2010 08:52 PM

Who can tell me anything about this unusual amplifier
 
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Wandering around the Internet I came across this, to me unusual solution amps, so I asked anyone who knows a little more to say about this concept. I made it, a little test, I listened and I can tell you that sounds very encouraging. So far I have not encountered this kind of input stage.Only I know about this is to be called complementary-differential input stage.Any helpful information is welcome.Thanks.

Moji Audio projekti

diy_audio_fo 4th November 2010 09:43 PM

Quote:

Originally Posted by ati (Post 2354513)
Wandering around the Internet I came across this, to me unusual solution amps, so I asked anyone who knows a little more to say about this concept. I made it, a little test, I listened and I can tell you that sounds very encouraging. So far I have not encountered this kind of input stage.Only I know about this is to be called complementary-differential input stage.Any helpful information is welcome.Thanks.

Moji Audio projekti

The two input transistors are just a standard differential, albeit they are of different polarity.
This way you save a resistor or CCS at the emitters.

I saw in the '90 an amplifier on Internet the resembles this one. I'll try to retrieve the link (it was someting like q4tech (but it is not q4tech.com))

jaycee 4th November 2010 10:14 PM

I must admit when I saw that, I thought it was an incomplete circuit?

Did you mean this - 4QD-TEC: Low distortion Audio amplifier

ati 4th November 2010 10:14 PM

In a million years ...
 
I guess you're right! I crossed the seeds of a million times and not noticed the similarity. I guess because it is so grossly drawn. Thank you very much. Now I have a starting point.


4QD-TEC: Low distortion Audio amplifier

ati 4th November 2010 10:17 PM

I guess you're right! I crossed the seeds of a million times and not noticed the similarity. I guess because it is so grossly drawn. Thank you very much. Now I have a starting point.That is: 4QD-TEC: Low distortion Audio amplifier

diy_audio_fo 4th November 2010 10:20 PM

Quote:

Originally Posted by jaycee (Post 2354588)

You are completely right!
Many thanks for saving my memory :-)

ati 4th November 2010 10:29 PM

Can anyone tell me if this input stage is worse, better or similar to the other input stage. You have to admit that it is not just everyday! Brilliant memory diy_audio_fo

AKSA 4th November 2010 10:29 PM

Bora is wonderful at creating totally off the wall amps!

This is a Rush Cascode diff pair; input to left device, fb to right, single current through both.

I don't like the CFP output stage for AB, but he's certainly made the best of it.

Neat circuit, input stage would confer very different distortion profile. Probably sounds very good.

Hugh

ati 4th November 2010 11:05 PM

Sounds pretty good, so I wondered what I listen to. Is it just another amp or perhaps, finally something worthwhile. For now promises ...


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