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Old 3rd March 2010, 08:03 PM   #41
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Hello,
you can find very god russian silver mica caps, the maximum value I've found is 0,2uF tollerance 0,3%.
See test caps:
Stanley and Oliver 300B Project
Normally high impedence RIAA id not a god performer.
Ciao
Guglielmo
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Old 4th March 2010, 04:00 AM   #42
eeyore is offline eeyore  Australia
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Old 4th March 2010, 06:10 AM   #43
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Quote:
Originally Posted by guglielmope View Post
Hello,
you can find very god russian silver mica caps, the maximum value I've found is 0,2uF tollerance 0,3%.
See test caps:
Stanley and Oliver 300B Project
Normally high impedence RIAA id not a god performer.
Ciao
Guglielmo
Ciao Gulglielmo, I'm from Cividale but I live in Sydney. What a surprise!
The 300B is really good.
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Old 7th March 2010, 01:34 AM   #44
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I finis PCB test. I will test pcb and Phono next day. you can se the PCb please!
thank
Attached Images
File Type: jpg Phono-test-2.jpg (390.9 KB, 925 views)
File Type: jpg Phono-test-1.jpg (507.9 KB, 788 views)
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Old 9th March 2010, 03:14 PM   #45
torsken is offline torsken  Norway
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Old 10th March 2010, 06:07 PM   #46
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Old 10th March 2010, 07:09 PM   #47
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Guglielmo,
The original version of this phono preampl. use low impedance RIAA but the experience done on Phono End is positive.

Hi-end phono preamplifier

In the Phono End I have got a better sound and no noise using medium impedance RIAA.
In general the low impedance RIAA should have some advantages in terms of noise but in this case we are obliged to use like interstage and RIAA network large value MKP capacitors.
If we increase the impedance of RIAA we can use many kind of products like the best silver mica and Jensen copper film paper in oil.
The pcb can be used for both types of RIAA.
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Old 10th March 2010, 08:45 PM   #48
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Old 10th March 2010, 10:53 PM   #49
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Old 15th March 2010, 02:21 PM   #50
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