Simplistic NJFET RIAA - Page 944 - diyAudio
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Old 16th March 2013, 02:13 PM   #9431
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polystyrenes are ok for this purpose.
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Old 16th March 2013, 02:16 PM   #9432
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You use interesting resistors.
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Old 16th March 2013, 02:31 PM   #9433
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What resistors did you find interesting JG ?
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Old 16th March 2013, 02:35 PM   #9434
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Quote:
Originally Posted by Tea-Bag View Post
Help me think this out guys.
In RIAA,
We are looking at 15nf caps, plus - a 150pf or 300pf I guess. Total 15.15-15.3nf
I assume this is important. Would a silver mica or polystyrene work best?
PCX has 150pf polystyrenes. (Silver mica too).
Its important to have the right value in this design, and yes, silver mica and polystyrene are great trim caps. As it is matching the semis well between channels. *Two K369BL of 11mA IDSS when tracing curves are pictured in the attachment.
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Old 16th March 2013, 02:38 PM   #9435
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Old 16th March 2013, 02:44 PM   #9436
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Hi buzz

Look for cannon golden inserts.... the small ones in the picture.
192900-0633 - ITT CANNON - STIFT, LOET GOLD 13A | Farnell Schweiz
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Old 16th March 2013, 02:45 PM   #9437
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Quote:
Originally Posted by Salas View Post
Its important to have the right value in this design, and yes, silver mica and polystyrene are great trim caps. As it is matching the semis well between channels. *Two K369BL of 11mA IDSS when tracing curves are pictured in the attachment.
You have got a new toy
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Old 16th March 2013, 02:51 PM   #9438
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Just arrived.
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Old 16th March 2013, 03:03 PM   #9439
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After some more hours listening I am glad to report the tone is really good. No stridency no bass blurring, sweet mids and that magical super wide soundstage.

I read on the papers of Allen Right that matching riaa components between channels is really important to preserve a very tight gain/phase relationship so as not to corrupt the stereo image.... totally agree.

In this case I was not able to follow the prescribed cap / resistors values due to stock shortage but am getting really good at simulating riaa components.... This time it was a total hit from the start... no need for further trimming.

Please bear in mind that 15.15nF are meant to be 15.15nF any deviation will blurr everything. If you can no get the exact values, trimming must be done in "all" riaa components.

I am willing to help of course.
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Old 16th March 2013, 03:05 PM   #9440
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Quote:
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Just arrived.
Would you test some k170BL with 8mA and 7.5mA ?

Would like to confirm my findings.
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