Simplistic NJFET RIAA - Page 644 - diyAudio
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Old 8th June 2011, 02:22 PM   #6431
RCruz is offline RCruz  Switzerland
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If R3 = 45k804 and R4 = 6k81

I would use
R3 = 45804 // 3M

C2 = 47nF // 10pF (Silver micas are ok here)
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Old 8th June 2011, 02:47 PM   #6432
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Quote:
Originally Posted by RCruz View Post
If R3 = 45k804 and R4 = 6k81

I would use
R3 = 45804 // 3M

C2 = 47nF // 10pF (Silver micas are ok here)

Ricardo sorry for the trouble:

R3 45K804
R4 6K81 is paralleld with 1Meg = 6K764

Last edited by merlin el mago; 8th June 2011 at 03:01 PM.
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Old 8th June 2011, 05:19 PM   #6433
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I already am taking that in consideration.

Just add a 3M in parallel with the 45k804.

That will keep you very close to the 500.5 pole and will give you more presence in the mids.

The C2 = 47nF with 10pF in parallel can be done latter.
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Old 8th June 2011, 05:23 PM   #6434
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So I left C2 47nF & only parallel 3M with 45K804, right?

Now I have 1M paralleled with 45K804 & 47nF paralleled with 100pF & sounds great
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Old 8th June 2011, 05:31 PM   #6435
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1M would be good if you had 47k but as you have a lower value, 45k804 you need to parallel 3M.

In this case 100p for the 47n is too much.... 10p should do it but you can try without it because the DMM error might be more influential than this small cap.

Last edited by RCruz; 8th June 2011 at 05:34 PM.
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Old 8th June 2011, 08:19 PM   #6436
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First listening tests shows that now the RIAA is very accurate because sounds very equilibrated to mi ears just by curiousity I'm tempted to buy the inverse RIAA to Jim Hagerman to be sure if measure well.

I don't have words to express my grateful for your excellent job Ricardo, could you help me with another tube RIAA for a friend?
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Old 8th June 2011, 09:29 PM   #6437
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Let it burn for a while and than report back so we can see if you keep your first impressions

My simulations never go far away from the proposed Salas values... I just try to find the needed adjustments to fine tune the 500.5 Hz turnover point based on DMM measurements of all the real parts. This 318uS pole is really important for the real instrumentīs timbre reproduction.

As for the tube riaa I can try ... Let me know the schematic and the DMM values of the unsoldered parts.

This will be very usefull as a starting point because I want to try the itch

PS:
Hagermanīs Iriaa includes a 3.18uS 50kHz pole ... It will not work perfectly in this case.

Last edited by RCruz; 8th June 2011 at 09:36 PM.
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Old 9th June 2011, 12:54 PM   #6438
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Only curiosity: why Hagerman IRIAA don't work in this case?

Received today other toy to play: Isokinetik to add 8gr effective mass to tonearm
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Old 9th June 2011, 01:07 PM   #6439
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Default Puresound P10 phono RIAA

Puresound P10 phono RIAA, schematic & pic (N.B. still don't soldered the 4 ouput caps FT-3 0.47uF)

P.S. Nick if you want I open other thread.
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Old 9th June 2011, 01:16 PM   #6440
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Quote:
Originally Posted by merlin el mago View Post
Only curiosity: why Hagerman IRIAA don't work in this case?

Received today other toy to play: Isokinetik to add 8gr effective mass to tonearm
Because hagerman does not follow Lipshitz riaa curve in the higher frequencies. Haggerman (as well as AMS and Dartzel) prefer a boost in the high frequencies with an extra pole at 50kHz.

Always wondered about the Isokinetik stuff... let us know how it sounds.
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