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Old 14th December 2011, 04:36 PM   #3581
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
If i would have the final saying then i would prefer to get the job done just right and not over engineer it. Too much heat is not what i want. The circuit itself had superb suppression of PSU anyway. Cascoded mirrors, cascodes with mirrored and shunted bias everywhere.
This is not a simple single ended phono where the break through of the PSU is clearly audible.
And I agree to that!
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Old 14th December 2011, 04:38 PM   #3582
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Ok, you are my man. Make the decision or we talk here for the next 3 years (:
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Old 14th December 2011, 04:42 PM   #3583
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I did put in the 4 extra transistors for you,, as I increased the mirror impedance by adding helpers and bleeders....

Michael
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Old 14th December 2011, 04:42 PM   #3584
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Ok, you are my man. Make the decision or we talk here for the next 3 years (:
The (designed) 160mA (about) is good for the 105mA demand. No change needed!
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Old 14th December 2011, 04:46 PM   #3585
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I did put in the 4 extra transistors for you,, as I increased the mirror impedance by adding helpers and bleeders....

Michael
Cool I like that.
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Old 14th December 2011, 04:49 PM   #3586
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Thanks Michael and Frans. So we only need the final schematic and make the decision if we make the EQ adjustable and how.
By the way i found now a really god replacement for the ultra low Rbb´ unobtainiums.
They are the Sanyo 2SA1208 and 2SC2910. They are in full production. Please do not redesign the circuit though. The multi degenerated input gives us less distortion then a pair of those with 5 ohm degeneration so i simply put this here for completing my list.
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Old 14th December 2011, 04:52 PM   #3587
MiiB is offline MiiB  Denmark
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there's also one other thing missing.. the input impedance. how to make that variable..and what range the variation needs to be...
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Old 14th December 2011, 04:54 PM   #3588
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I'd vote for those early german, and eastern block variations (there are debates, if these are real, though). I might have a closer look later.

Rüdiger
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Old 14th December 2011, 05:04 PM   #3589
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Lets not make it too complicated.....Stick to the man...!!
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Old 14th December 2011, 05:15 PM   #3590
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Lets not make it too complicated.....Stick to the man...!!
I guess it's a matter of preferences...
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