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#401
Joachim Gerhard said:
Ricardo, here are the trimmers :
Bestellen Sie variable Trimmkondensatoren Trimmkondensator 300V 5pF bis 60pF Vishay MCO228180908003 online - versandkostenfrei ab 50 € Nettobestellwert.
Cool, they droped the price. This is the price for one and you have to by 5 minimum.
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Thank you... I will try those.

Joachim Gerhard said:
I promissed the values for the shunt RIAA. They are derived by hard mathematics. After i calculated the values Frans has put them in the simulator and it worked.
I am sure Ricardo will come up with even more precise values.
Treble cap : 3.4483 nF
Series connection : 31.9 kOhm 10 nF
Bass resistor : 217.6 kOhm
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I will study this 🙂

Joachim Gerhard said:
Silicon-carbite diodes in the PSU, R-Core transformers, i use Phoenix from Japan.
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A source for those TX would be a pus also

Joachim Gerhard said:
Electrolytics : Mundorf silver-gold 4 pole.
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Maybe you should also consider the Jensen four pole.... I found those really good in the trebble
 
#402
I added your corrections, please tell me if I missed something.
Nevertheless simulated model seems not to work still.
Any thought?
 

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#404
FdW said:
Add a capacitor, say 100u to 1m, in parallel to R11, then add a few base stoppers to the transistors, say 50 to 100 Ohm. Anyway that is what I would do 🙂
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yes agree with you, but this won't change the fact that circuit seems to not simulate right or better it doesn't operate properly.
any hint?
Maybe I am using the wrong model for the differential opamp?
 
#406
Joachim Gerhard said:
I promissed the values for the shunt RIAA. They are derived by hard mathematics. After i calculated the values Frans has put them in the simulator and it worked.
I am sure Ricardo will come up with even more precise values.
Treble cap : 3.4483 nF
Series connection : 31.9 kOhm 10 nF
Bass resistor : 217.6 kOhm
Click to expand...
Well, after some hard math :joker:, I found that your values would be almost perfect ... as a matter of fact, much more linear aproximation than in the original paradise.

But I still believe the outcome would tend to Nasal sound with too much attack ... meaning, slight lack of bass and quite snappy.

I admit that your bass resistor is ok so I would suggest:
Trebble cap: 0,003447 (3.447nF)
Mid freq series: 31.64k ohm and 10nF
Bass resistor: 217.6 k ohm

Off course these values are much simpler to get here because we do not need to care about the second stage miller (depending on gain) of second stage.

Anyway, I would like to have Stefano's input because I know he is quite good at this also.
 
#409
Joachim Gerhard said:
The Panasonic material should be available from PCB makers that do RF stuff.
There is also Material from Rogers and Isola but Bob Cordell posted that the Panasonic is even better.
We have silver plating on the Pardise boards because we wanted to avoid any magnetic material in the plating. Gold plaiting is usually done with nickel first and then gold on top.
The problem with the Paradise boards is that the silver easy oxidizes.
It is not a tragedy but after a while it does not look as pretty any more.
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Paradise PBC tracks, according to pictures, are protected by solder resist. What is the purpose of silver plating? Bare copper is better solution , or even solder plated bare FR4 PCB in Audio Research fashion.They believe that solder resist degrades sound quality.
 
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#414
kamis said:
Paradise PBC tracks, according to pictures, are protected by solder resist. What is the purpose of silver plating? Bare copper is better solution , or even solder plated bare FR4 PCB in Audio Research fashion.They believe that solder resist degrades sound quality.
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True. Solder Mask will prevent silver from tarnishing.
The silver bath will help conductivity IMHO.
 
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