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Old 30th May 2010, 06:16 PM   #3761
Salas is online now Salas  Greece
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Quote:
Originally Posted by Franz Gysi View Post
O.K.

Next project.

Or better: next step in this project?

Franz
Best step in this project.
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Old 30th May 2010, 06:19 PM   #3762
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Quote:
Best step in this project.
Smile
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Old 30th May 2010, 08:46 PM   #3763
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Originally Posted by Salas View Post
Don't know, I have listened to both balanced and unbalanced components in several systems but the parameters are too many so to speak confidently. A fair thing would be to make the same CCT in both guises with same parts and live with it enough before commenting. Me I always follow economy. Due to I am not an engineer, I try to make simplest before I lose the ball so I go SE. I am pro useful, i.e. easy to make and fulfilling most of my subjective needs, not unconditionally best, I can't be sure I can design or control such anyway. J.Gerhard had made many experimental CCTs in the course of his MPP thread and maybe he can be more adequate for adding his comments on your SE VS Balanced query, if you ask there. He is good in describing subjectively too.
J. Gerhard answer: Mpp I will go to try balanced due to the fact the rest of mine system is balanced.
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Old 30th May 2010, 09:11 PM   #3764
RCruz is offline RCruz  Switzerland
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Hi Merlin

Are you pointing to a balanced riaa ?
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Old 31st May 2010, 09:03 AM   #3765
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Salas

I measured my 100 pieces 2SK170V with 10VDC and 100R resistor.

Result:

9-10 mA 8 pcs.
10-11 mA 25 pcs.
11-12 mA 24 pcs.
12-13 mA 18 pcs.
13-14 mA 18 pcs.
14-15 mA 7 pcs.

So, I have no chance to build the 15mA Version of this circuit.

Which circuit version would you recommend to obtain 60dB gain?

I would prefer to go with 10 to 12mA, looking at the available numbers.

Franz
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Old 31st May 2010, 11:58 AM   #3766
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Quote:
Originally Posted by RCruz View Post
Hi Merlin

Are you pointing to a balanced riaa ?
Hi Rcruz

Yes, about output cap no back to Auricap: Obbligatos perform extraordinarily well togheter the Vishay.

Mine idea for balanced is one big pcb with the 4 regs. togheter the 4 Simplistic NJFET Phono RIAA & in a separate box the Tx + PSU, first approach will be using only using the same 2 Tx & 2 PSU that I'm using now & after upgrade for 4 Tx + 4 PSU.
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Old 31st May 2010, 12:09 PM   #3767
Salas is online now Salas  Greece
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Quote:
Originally Posted by Franz Gysi View Post

I would prefer to go with 10 to 12mA, looking at the available numbers.

Franz
OK, for 11mA then.
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File Type: gif 60dB11mAIDSS.gif (8.0 KB, 1583 views)
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Old 31st May 2010, 12:35 PM   #3768
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@Salas

I see that now in RIAA for C2 are you using 15,5nF
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Old 31st May 2010, 12:39 PM   #3769
massimo is offline massimo  Italy
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.... and 100uF instead of 470uF for C5
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Old 31st May 2010, 12:57 PM   #3770
Salas is online now Salas  Greece
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Its the way they interact with the rest. The target Lipshitz is the same. Resistor values change with different IDSS tunings and create a new total filter transfer function, so I compensate C3. For 100uF change, R9 is larger here for instance, so Q2 need not run more current to bias circa 10V, hence C5 is enough RC.

P.S. Due to tolerances of all components, C3 is advised to be trimmed by ear in each individual system by preference.
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