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25th June 2011, 09:00 PM
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#1 |
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diyAudio Member
Join Date: Jul 2005
Location: milan
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Common base VAS
this amplifier is a modification of a-680 diyGene.com
is an inverting amplifier so don't need current mirror I have connected jfet source on GROUND as tube's design that works very fine  DIYGene - Electronics DIY, Hi Fi , amplifier
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visit my best audio idea http://www.esafono.it/DACTONE.htm Last edited by Stee; 25th June 2011 at 09:05 PM. |
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26th June 2011, 01:22 AM
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#2 |
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diyAudio Member
Join Date: Aug 2005
Location: K-town
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If you take away the summing node and make it gnd, the diff amp is no longer a diff amp. You have two common source amplifiers, with different transfer characteristics and distortion spectrum. If it works it works, but it is nothing particularly special. Symmetrical folded cascode VAS. Is there a different perception of the sound after swapping the input stage?
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Last edited by CBS240; 26th June 2011 at 01:25 AM. |
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26th June 2011, 08:17 AM
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#3 |
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diyAudio Member
Join Date: Jul 2005
Location: milan
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yes of course
never listening a better amplifier
 probably because don't have differential stage or because have ground reference like triode (not so easy to found) also because I have simulate internal balanced power supply with two transformers in input one of these do an inverting phase and the same again in output polarity  in other words to get the advantage of balanced sound without risk of adding errors just take a power transformer as input converter you can simulate the natural balance of power supply like true balanced AMP inverting a channel input (secondary polarity) and output (loudspeaker)
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visit my best audio idea http://www.esafono.it/DACTONE.htm Last edited by Stee; 26th June 2011 at 08:44 AM. |
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26th June 2011, 02:43 PM
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#4 |
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diyAudio Member
Join Date: Jul 2005
Location: milan
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see a ZOOM
of input and VAS stages
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