Mpp - Page 359

FdW · 14th December 2011, 04:36 PM

Quote:

Originally Posted by Joachim Gerhard

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!

Joachim Gerhard · 14th December 2011, 04:38 PM

Ok, you are my man. Make the decision or we talk here for the next 3 years (:

MiiB · 14th December 2011, 04:42 PM

I did put in the 4 extra transistors for you,, as I increased the mirror impedance by adding helpers and bleeders....

Michael

FdW · 14th December 2011, 04:42 PM

Quote:

Originally Posted by Joachim Gerhard

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!

FdW · 14th December 2011, 04:46 PM

Quote:

Originally Posted by MiiB

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.

Joachim Gerhard · 14th December 2011, 04:49 PM

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.

MiiB · 14th December 2011, 04:52 PM

there's also one other thing missing.. the input impedance. how to make that variable..and what range the variation needs to be...

Onvinyl · 14th December 2011, 04:54 PM

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

MiiB · 14th December 2011, 05:04 PM

Lets not make it too complicated.....Stick to the man...!!

Onvinyl · 14th December 2011, 05:15 PM

Quote:

Originally Posted by MiiB

Lets not make it too complicated.....Stick to the man...!!

I guess it's a matter of preferences...

14th December 2011, 04:42 PM	#3583
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	I did put in the 4 extra transistors for you,, as I increased the mirror impedance by adding helpers and bleeders.... Michael __________________ http://www.linkedin.com/pub/michael-...esen/a/a55/544 http://www.raidho.dk/

14th December 2011, 04:52 PM	#3587
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	there's also one other thing missing.. the input impedance. how to make that variable..and what range the variation needs to be... __________________ http://www.linkedin.com/pub/michael-...esen/a/a55/544 http://www.raidho.dk/

14th December 2011, 04:54 PM	#3588
Onvinyl diyAudio Member Join Date: Aug 2002 Location: Germany	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 __________________ "I can feel what's going on inside a piece of electronic equipment. I have a sense that I know what's going on inside the transistors." Robert Moog

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14th December 2011, 04:38 PM	#3582
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Ok, you are my man. Make the decision or we talk here for the next 3 years (: