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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 10th May 2011, 09:45 PM   #6201
RCruz is offline RCruz  Switzerland
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Simplistic NJFET RIAA
Hi Salas

On my 48dB (DL160) build I reduced the 15.72nF cap to 15,33nF as you suggested and I got much better spatiality retaining very detailed bass. Also gained in high freq detail and overall "bite".

I was using SSG-1 15.72nF and now I am using 15n Polystyrene*& Tin Foil 5% (RT) // 330p Smica.... Wonderfull stuff.... I kept it running for 4 hours and it is opening nicely now.

It is drier than with the SSG-1 SM but I like it.

Now I would like your oppinion about the Silver Mica SGM Capacitor from URSS... I have some 7170pF 350V 0.3%... I could use two plus some Cornell Dub.. small SM values to get to 15,33nF
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Old 10th May 2011, 09:48 PM   #6202
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
It is 15.33n in the PDF for HIMC/MM, yes. USSR SGM are mushier but silkier compared to polystyrene. Its a system tuning thing to play with I guess. All those caps are good quality non the less.
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Old 10th May 2011, 11:04 PM   #6203
RCruz is offline RCruz  Switzerland
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By mushier you mean (thick, soft, and pulpy) right ?
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Old 10th May 2011, 11:08 PM   #6204
Salas is offline Salas  Greece
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Softer, more sentimental side of real. Like from apple to banana.
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Old 10th May 2011, 11:36 PM   #6205
RCruz is offline RCruz  Switzerland
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Perfect definition

I guess I will try another option than.... I have some SSG-1 ~0,012uF 350V 0,5% I will trim with some other smaller SM first. I like the polystyrene sound of the RT but I seem to miss something in the highs.... DIY is a never ending story
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Old 11th May 2011, 06:43 PM   #6206
DARIO1997 is offline DARIO1997  Italy
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Default IRFP9140 or IRFP9140N

Hi Salas,
I have, for shunt regulator, IRFP9140N and no IRFP9140.
Is good for shunt IRFP9140N?
Regards.
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Old 11th May 2011, 07:06 PM   #6207
Salas is offline Salas  Greece
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It has more Crss but it will work. Maybe you got IRFP9240? Better than 9140N.
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Old 11th May 2011, 07:54 PM   #6208
DARIO1997 is offline DARIO1997  Italy
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Default IRFP9140 or IRFP9140N

Hi Salas,
I not have IRFP9240; so if use IRFP9140N, what's problem will the shunt regulator?
Regards
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Old 11th May 2011, 07:59 PM   #6209
Salas is offline Salas  Greece
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No practical problem. Just a bit less bandwidth.
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Old 11th May 2011, 08:02 PM   #6210
DARIO1997 is offline DARIO1997  Italy
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Default IRFP9140 or IRFP9140N

No have problem also RIAA Phono?
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