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Old 4th November 2010, 08:52 PM   #1
ati is offline ati  Serbia
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Default Who can tell me anything about this unusual amplifier

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
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Old 4th November 2010, 09:43 PM   #2
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Quote:
Originally Posted by ati View Post
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))
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Old 4th November 2010, 10:14 PM   #3
jaycee is offline jaycee  United Kingdom
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I must admit when I saw that, I thought it was an incomplete circuit?

Did you mean this - 4QD-TEC: Low distortion Audio amplifier
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Old 4th November 2010, 10:14 PM   #4
ati is offline ati  Serbia
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Smile 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
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Old 4th November 2010, 10:17 PM   #5
ati is offline ati  Serbia
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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
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Old 4th November 2010, 10:20 PM   #6
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Originally Posted by jaycee View Post
You are completely right!
Many thanks for saving my memory :-)
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Old 4th November 2010, 10:29 PM   #7
ati is offline ati  Serbia
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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
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Old 4th November 2010, 10:29 PM   #8
AKSA is offline AKSA  Australia
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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
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Old 4th November 2010, 11:05 PM   #9
ati is offline ati  Serbia
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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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