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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 30th January 2012, 04:48 PM   #7161
chalkandtalk is offline chalkandtalk  United Kingdom
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Found it!

Superb

Pics will follow when it's done

Thank you so much

Chalk
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Old 30th January 2012, 04:51 PM   #7162
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Let us know your progress, cheers.
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Old 30th January 2012, 05:24 PM   #7163
vdi_nenna is online now vdi_nenna  United States
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Salas,

That is a good evolution for me, because I can build the pre-pre first and test it against my current phono pre, then move on to the MC pre.

Thanks,

Vince
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Last edited by vdi_nenna; 30th January 2012 at 05:35 PM.
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Old 30th January 2012, 06:34 PM   #7164
df_genius is offline df_genius  United Kingdom
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Quote:
Originally Posted by merlin el mago View Post
Polysterenes are also very good, RIAA caps important thing is tolerance & accuracy as stated by RCruz. If yours styrenes are 1% surely sounds better than teflons 5% or more tolerance.
I'll be measuring and matching them as my meter can measure capacitance. I intend to match the 5% Teflons up using low-value polystyrenes. Hopefully the Teflons will be here in the next couple of days so I can get on with the build.
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Old 31st January 2012, 09:45 PM   #7165
chalkandtalk is offline chalkandtalk  United Kingdom
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I have just read the pdf on the HiMM (great info by the way) and need to check with you about matching the fets.

In the range 8 to 8.5mA:

I have 4 at 8.4mA. So these could be Q1 and Q2 (two for each channel).

I also have 2 at 8.3mA. So these could be Q3.

Finally I have 2 at 8.2mA. These could be Q5.

Have I understood correctly?
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Old 31st January 2012, 10:04 PM   #7166
Salas is offline Salas  Greece
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Yes.
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Old 31st January 2012, 10:08 PM   #7167
Salas is offline Salas  Greece
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Quote:
Originally Posted by vdi_nenna View Post
Salas,

That is a good evolution for me, because I can build the pre-pre first and test it against my current phono pre, then move on to the MC pre.

Thanks,

Vince
Not a bad plan. Although the complete Simplistic is the business in the end of the day, you can go step by step at your leisure. There is a pre-pre thread also where you can get ideas, as some members had built it on its own too.
http://www.diyaudio.com/forums/analo...ep-up-amp.html
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Old 31st January 2012, 10:09 PM   #7168
chalkandtalk is offline chalkandtalk  United Kingdom
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Great Thanks
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Old 1st February 2012, 03:38 AM   #7169
kstlfido is offline kstlfido  United States
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Default Listening fun! And... any more gain?

Just a note to say thanks again Salas. I've been listening, listening and listening. Got me hunting for vinyl now! Must have picked up 50 LP's in the past 2 months. I can really hear the dynamics of some recordings now. Just listening to Earth Wind and Fire- Praise. It really came alive! Donald Fagen's recordings are also quite lively. Others sound a bit dead by comparison.

One day, I'll get the Salas RIAA in a box!

One question- Is there any way to get a few more db out of the circuit, apart from adding source bypass caps? I built the MC RIAA 8-8.5 idss from your Document version 11.02.F0.

I do have some more matched jfets in the 8.5-10mA idss range. Though I gather the RIAA values would need to recalculated.

If hard to do, I'll leave as-is. I just like running straight w/o a line amp, but could go that route if needed.

Anyway, big thanks again from Berkeley, CA! You got me back into vinyl!

-Kent
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Old 1st February 2012, 03:47 AM   #7170
Salas is offline Salas  Greece
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Cheers Kent. With the parts quality you used and fine p2p workmanship its a pity to mod it. Use Sowter 9395 autoformer attenuator and utilize its +6 dB gain tap. Two birds with one stone. Best than any resistive pot and your gain there. Has a +12dB gain tap even.
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