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Old 4th July 2011, 12:26 PM   #6581
RCruz is offline RCruz  Switzerland
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I am glad you are enjoying your Salas Simplistic so much.... It sounds that good mainly due to your carefull work. Thank you so much for your efforts. I knew you would also hear the differences.

IMO the 318uS zero point is VERY important for the overall Timbre of the instruments.
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Old 4th July 2011, 12:33 PM   #6582
Salas is offline Salas  Greece
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So what is the trimmed values network and on what gain machine? So to keep in record and measure on some opportunity. Some sketch pls.
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Old 4th July 2011, 01:09 PM   #6583
RCruz is offline RCruz  Switzerland
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Merlinīs Salas riaa has double paralleled input jfets and works with 45v Vin.

R1 = 3k3r
R3 = 45804r // 4M99 = 45388r
R5 = 1M
So actual R3 for calc purposes should be around 46428r
R4 = 6810r // 1M = 6764r
C2 = 47.01nF

C2 x R4 = 318uS

I am not sure about C3 (15 ~16nF)

R2 under the paralleled input jfets is 15r

As he does not use the source cap bypass I guess it would produce 58dB gain.
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Old 4th July 2011, 01:12 PM   #6584
Salas is offline Salas  Greece
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OK thanks. This trimming falls almost between 1% components tolerances. Tricky.
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Old 4th July 2011, 01:22 PM   #6585
RCruz is offline RCruz  Switzerland
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It is quite difficult to reach the correct values.... I am wondering if you could suggest a combination of smaller caps values so we could reach 15.33nF and 47nF with more precision.
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Old 4th July 2011, 01:28 PM   #6586
Salas is offline Salas  Greece
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Whatever you can combine from 1% spec caps is safer to average well near the target value.
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Old 4th July 2011, 01:32 PM   #6587
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How cardinal is 1% accuracy to the RIAA equalization components?
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Old 4th July 2011, 01:33 PM   #6588
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Quote:
Originally Posted by RCruz View Post
Merlinīs Salas riaa has double paralleled input jfets and works with 45v Vin.

R1 = 3k3r
R3 = 45804r // 4M99 = 45388r
R5 = 1M
So actual R3 for calc purposes should be around 46428r
R4 = 6810r // 1M = 6764r
C2 = 47.01nF

C2 x R4 = 318uS

I am not sure about C3 (15 ~16nF)

R2 under the paralleled input jfets is 15r

As he does not use the source cap bypass I guess it would produce 58dB gain.
C3 15.89nF
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Old 4th July 2011, 01:40 PM   #6589
Salas is offline Salas  Greece
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Quote:
Originally Posted by Joshua_G View Post
How cardinal is 1% accuracy to the RIAA equalization components?
Its good to know you have made what you see on circuit reasonably accurately so to exclude unknown parameters when tuning a cart's load, VTA, VTF, etc. Or when you want to play with the filter itself a bit for your average tone with your records collection, system's tonal synergy, whatever.
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Old 4th July 2011, 01:45 PM   #6590
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Quote:
Originally Posted by Salas View Post
Its good to know you have made what you see on circuit reasonably accurately so to exclude unknown parameters when tuning a cart's load, VTA, VTF, etc. Or when you want to play with the filter itself a bit for your average tone with your records collection, system's tonal synergy, whatever.
Would 1% accuracy to the RIAA equalization components eliminate the need for tweaking values? Or is it always up to a personal taste and adjustment to the preferred tone of the entire system?
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