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Old 1st December 2012, 10:04 PM   #7821
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Ok, cool. You took 3 x Bf instead of 4. 4 will bring the gain slightly up ( plus 1.5dB a assume ), so i am happy.
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Old 1st December 2012, 10:06 PM   #7822
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C5 could be even lower when a slight subsonic filter is wanted.
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Old 1st December 2012, 10:07 PM   #7823
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If it works then one of my dreams comes true, a one stage RIAA if we do not count the buffer.
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Old 1st December 2012, 10:21 PM   #7824
sampler is offline sampler  Lithuania
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Quote:
Originally Posted by RCruz View Post
Hi Sampler

Can you post a file with the values you got in your sim ?

I need to find input stage output imp at 1kHz

Does your sim give the output imp with the riaa filter connected ?

Can you plot this impedance without the riaa filter connected ?
Hi Ricardo,
This is output impedance without anything connected to output, so it's about 1.3M parallel to shunting resistor 130k in Joachims schematics.

Quote:
Originally Posted by Joachim Gerhard View Post
Sampler, i use more or less the same input structure in my tube RIAA and it works.
For Ulf, i will show you the Transcendent RIAA. The input tubes in mine are aranged the same way.
But 1 tube is not the same piece of cake as 3 BF862 running near Ids with just ~20V to bias properly. I'm sure it will work, just getting to stable dc op point will be quite nontrivial. Here is a temperature sweep of whole circuit vs. output voltage, take it with a grain of salt but the picture is clear.
I think I saw a thread couple years ago were very similar concept was discussed in great detail, where is that search button...
Edit: Found it Great stuff with lot's of guru's
Attached Images
File Type: png temp_sweep.PNG (14.6 KB, 149 views)

Last edited by sampler; 1st December 2012 at 10:26 PM.
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Old 1st December 2012, 10:41 PM   #7825
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Sure, in the tube RIAA is use a tube cascode with 8mA idle.
On the other hand to build the input stage is not a big deal.
Maybe i find the time tomorrow.
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Old 1st December 2012, 10:45 PM   #7826
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Salas thinks that this circuit has not much to do with his Simplistic so i renamed it to Cro Magnon.
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Old 1st December 2012, 10:48 PM   #7827
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cromagnon
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Old 2nd December 2012, 10:29 AM   #7828
RCruz is offline RCruz  Switzerland
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Well, at least yu did not call it Homo neanderthalensis
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Old 2nd December 2012, 11:52 AM   #7829
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That was my first thought (:
A phono stage so simple that a cavemen can build it.
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Old 2nd December 2012, 11:56 AM   #7830
brianco is offline brianco  Ireland
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Location: Scottish Borders - Kelso; on the famous Tweed River!
Well....I'm in then!
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