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Old 1st February 2013, 06:14 PM   #1361
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Originally Posted by hesener View Post
There are people that say ( and I believe it) that a servo should have just enough authority to keep the circuit at optimum bias point, but not more.
Thank you very much Alfred , thats what i thougth but not knew .
IŽll try C5 at 220nF , but first iŽll find out if it is really a problem .
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Old 1st February 2013, 06:29 PM   #1362
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Or you can solder a resistor in parallel to R48, which seems easier.
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Old 1st February 2013, 07:09 PM   #1363
pdul is offline pdul  Denmark
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Have anybody thought about the supply voltage for the opamp? Not much headroom for pleasure with the 18v
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Old 3rd February 2013, 08:27 PM   #1364
pdul is offline pdul  Denmark
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bump
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Old 4th February 2013, 08:09 AM   #1365
RCruz is offline RCruz  Switzerland
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Have anybody thought about the supply voltage for the opamp? Not much headroom for pleasure with the 18v
What do you mean ?

Do you believe increasing that voltage would bring some improvements ?

Maybe a dedicated psu for the servo alone ?
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Old 4th February 2013, 08:58 AM   #1366
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Don't think it will help anything. It's true that the servo has to work much harder than usual but raising the supply will only safeguard against extreme fluctuations.

I wonder if someone with better understanding of the circuit would not explain the thinking behind the servo. It seems to me there are 14 transistors whose sole purpose in life is to apply the servo output to the input pairs - could this solution be just too complex and bringing additional dc noise and drift?
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Old 4th February 2013, 08:59 AM   #1367
pdul is offline pdul  Denmark
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What do you mean ?
I mean that 18v is the absolute max that the opamp can take. so better be shure that it doesnt exeed 18v
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Old 4th February 2013, 10:59 AM   #1368
RCruz is offline RCruz  Switzerland
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I mean that 18v is the absolute max that the opamp can take. so better be shure that it doesnt exeed 18v
I believe it is spec to +-18V and the Paradise shunts output +-18v sharp.... nothing to worry about.
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Old 5th February 2013, 12:00 PM   #1369
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If you keep having fidly trebble, you can increase load (reduce load resistor value)... I believe you should try 1200 ohm because your cart has 120 ohm output impedance and a good measure is to use 10x that value: Benz Micro | Cartridge Data | Vinyl Engine
Thanks RCruz, this tool I didnŽt know. I tried everything, 22K, 1,2k till down to 120R, but nothing was helpful. Today I will install the CompCaps (arrived today). And will relisten. It is really boring, belive me.
Hope it sounds better
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Old 5th February 2013, 12:14 PM   #1370
RCruz is offline RCruz  Switzerland
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Did you measure the caps and resistors you used in the riaa filter before you soldered them in the boards ?

What are CompCaps ?
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