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Old 5th July 2012, 03:10 PM   #6141
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In total the values are :
11nF
33.3nF
9.1k
73.5k
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Old 5th July 2012, 05:55 PM   #6142
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Some more stuffing has being going on.
For the RIAA is use Styroflex in the treble. I got exactly 11nF in both channels.
In the midrange i have 3 x FKP2 10 nF plus 3.3nF KP1830 for a total of 33.2nF, both channels the same, that is still 1%.
The smaller resistor is a Dale CMF55 non magnetic 9.09kOhm and the bigger one is a series connection of two Dale CMF55 for a total of 73.6kOhm.
For the servo i use LF411, that is a bit cheaper then the OPA134 and works as well.
I have to order more parts to finish.
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Old 5th July 2012, 09:13 PM   #6143
hesener is online now hesener  Germany
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great, you guys are getting there!
yes, the vias need no filling....

ricardo, its strange, i didnt measure any offset and had your boards connected to my cartridge no problem, sounded nice........

6mV / 2kohm is 3 microamps, too much definitely.... this is roughly the base current of one of the transistors of the input stage. i would be surprised if one of them is broken, but you may want to verify that. is the offset positive or negative?
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Old 6th July 2012, 05:58 AM   #6144
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Old 6th July 2012, 07:34 PM   #6145
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Hello Joachim,

My apologies to you all, to kind of butt in on this excellent well developed thread. Joachim, could you possibly give me some help with Riaa Values.

I am building a variant of your MMP high Z.

I am going for a 2 stage approach with 75us passive eq after the first transconductance gain stage, and the remaining 318,3180 time constants in a second, similar, zero feedback transconductance gain stage.

Could you give me any pointers to the 318,3180 RIAA values that i can possibly scale appropriatly to suit my required gain.

Many thanks.

Last edited by velvetsunrise; 6th July 2012 at 07:38 PM.
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Old 6th July 2012, 08:14 PM   #6146
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Joachim Gerhard View Post
In total the values are :
11nF
33.3nF
9.1k
73.5k
Humm

What should be the first stage output imp ?
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Old 6th July 2012, 08:21 PM   #6147
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Ricardo, that is for the new Paradise dubbed R2.
Do you think of the output impedance after the mirror ?

Velvet, i will check and come back to you.
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Old 6th July 2012, 08:26 PM   #6148
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Thanks Joachim, Thats very kind.
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Old 6th July 2012, 08:35 PM   #6149
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Quote:
Originally Posted by Joachim Gerhard View Post
Ricardo, that is for the new Paradise dubbed R2.
Do you think of the output impedance after the mirror ?
Yes.... my calc gives me a lower value for the main R

73.5k must be in parallel with mirror output imp
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Old 6th July 2012, 08:42 PM   #6150
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For 33.3n I get 9.545kr , 11.42n and 65675r (instead of 73.5k)
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