Ultrasimple mm/mc RIAA preamp 2 - Page 31 - diyAudio
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Old 9th February 2011, 12:03 PM   #301
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guess i`ll try bf245a instead of 2n5457.it should work.what do you think?
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Old 9th February 2011, 12:13 PM   #302
Salas is offline Salas  Greece
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BF245A OK.
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Old 15th February 2011, 04:01 AM   #303
tyman63 is offline tyman63  Singapore
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i am very new..is there a PCB kit that I can purchase to stuff the parts?
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Old 17th February 2011, 03:21 PM   #304
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hello againd :d

i`ve received the parts but the 2sk170 are GR.i`ve selected them in a few pairs with idss from 3.5ma to 6.2ma.on the schematic i saw i need BL`s with idss 8-8.5ma.what should i do so i can use one of the pairs of GR`s i have ?
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Old 17th February 2011, 03:24 PM   #305
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sorry three pairs of GR i wanted to say.which do you recommend ones with big or small idss?
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Old 17th February 2011, 03:49 PM   #306
Salas is offline Salas  Greece
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If this is not about Mad's and its about that one from my PDF come asking in the Simplistic RIAA thread please. Here is OT.
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Old 6th September 2011, 07:14 PM   #307
data is offline data  Australia
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Hay guys

I started reading this thread and very quickly became confused

I have a Ortofon 2M Red and I'm looking to try my hands at a MM jfet pre, which design here is best to go with?

I believe Mad's is the one that is suitable?

Edit:Guess I'll have to back track through the thread to get a clearer understanding...

Last edited by data; 6th September 2011 at 07:28 PM.
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Old 29th June 2012, 09:42 PM   #308
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Default I built one of these

Its a bit of a mess but it sounds fantastic. I'm using this with an old Shure M75ED on a standard SL1200MKII. A real open punchy sound. I put together a very simple unregulated mains power supply using some huge reservoir caps and chokes and after a few tweaks here and there i have completely eliminated power supply induced mains hum. Here's hoping it works as well when its all neat and tidy!
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Old 30th June 2012, 02:06 AM   #309
andyr is offline andyr  Australia
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Quote:
Originally Posted by Mad_K View Post
schematic:
I notice in the schematic that you have used:
* 20K Drain resistor leading into the RIAA section, and
* 2M2 shunt resistor on the 2nd stage Gate.

I have seen a slightly different version of this circuit which had:
* 240K Drain resistor leading into the RIAA, and
* 510K shunt resistor on the 2nd stage Gate.

Are you able to tell me what effect these values have on the circuit? IE.:

* is there a benefit in increasing the Drain res to 200K or 240K?
(I can see this would probably reduce the signal level coming out of the RIAA - which is already low ).

* is there a benefit in increasing the 2nd stage Gate resistor to 2M2?

Thanking you in advance,

Andy
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Old 1st July 2012, 02:09 PM   #310
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Default well,

Wish it used tubes ...


Quote:
Originally Posted by Mad_K View Post
This morning I threw together my own version of the "Pacific Riaa Pre". I can now say that I have a completely Single Ended feedback-free amplifier chain (Pacific+BZLS+SOZ) And a really nice sounding chain it has become.. This crude little riaa pre is too good to be true. My intention is to tweak it like nothing has been tweaked before (cascoding etc), hence the "fast & furious" building style; it's very effective though (took me about 3 hours to make). All components are matched to the tightest tolerances and to get as close as possible to the ideal riaa values which are 22K4, 3K257 + 97n6, 100R + 33n5.

Well, enough rambling; do yourself a favour and try this circuit!

Pictures:
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