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Old 30th December 2010, 09:26 PM   #5701
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look like the Ricardo TT

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Old 30th December 2010, 10:45 PM   #5702
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by nicoch46 View Post
look like the Ricardo TT

Excuse me !!!!!! My TT works perfectly
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Old 30th December 2010, 11:13 PM   #5703
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Old 31st December 2010, 06:35 AM   #5704
vgeorge is offline vgeorge  Greece
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A recent statement from Scott Wurcer!
Quote : Honestly, build Salas' Simplistic RIAA if you can HONESTLY tell it over a Blowtorch then get out your snowblower.
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Old 31st December 2010, 08:45 AM   #5705
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Quote:
Originally Posted by massimo View Post
see attachment
Thanks for the info. Why 300mA? We need a version as first shunt regulator / pre regulator which handles all the current like before.

Next use 3 shunt regs for each stage and share it for left & right channel. The shunts should be as near as possible to the amplifier.

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Originally Posted by Salas View Post
They are supposed to be looking on separated load nodes. Or at least that is what I thought was the idea. I would prefer to give chance to a dedicated first stage low Z active noise filter on the rail than all this complexity and dissipation non the less.
Correct and I agree.

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Originally Posted by RCruz View Post
I am ready for beta testing.... please let me know if I can mod over my previous build
Ricardo,

you know what I mean? Here again:

  1. use a preregulator in the power supply chassis
  2. use 3 regs in the amplifier chassis
  3. share the 1st reg for the 1st amplifier stages (connect the B+ from the left and right channel)
  4. same with the other regs for the 2nd & 3rd stage
If you like we can correspond by e-Mail for further questions.


A happy new year to all forum members here
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Old 31st December 2010, 08:59 AM   #5706
RCruz is offline RCruz  Switzerland
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Hi Joćo

I experimented using the same shunt for both right and left channels and also one shunt per channel.

The latter produces much more separation and detail.

Using two independent psu“s, further increases this effect.

Why not use 4 shunts instead of 3 .... feed both 1st stages individually and 2nd stages individually.

Why the need to feed the buffer individually ?
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Old 31st December 2010, 09:07 AM   #5707
RCruz is offline RCruz  Switzerland
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Just finished implementing the Lundahl SUT on one 48dB Riaa and the results are quite good.

No hum and the sound does not get too fat even with a 0.8mv cart... hope it works allright with the target (A special 0.15mV cart).

Strangely, I notice that the SUT amplifies the signal but also amplifies the noise floor, so the usual hiss I hear at full volume (without input signal) is also amplified.
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Old 31st December 2010, 10:05 AM   #5708
vgeorge is offline vgeorge  Greece
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Ricardo, you can try different placement and or shielding of the SUT. These things pick up noise easilly. I know it's best to be as close as possible to the RCA's. If you post a picture, maybe someone can help you more.
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Old 31st December 2010, 10:10 AM   #5709
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Ricardo you load the primary or sec ? there is a lot bla-bla on this ...search on AA
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Last edited by nicoch58; 31st December 2010 at 10:12 AM.
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Old 31st December 2010, 10:11 AM   #5710
RCruz is offline RCruz  Switzerland
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Hi vgeorge

I am sure ir is not picking up noise.... There is absolutely no hum.

The noise I am talking about is the normal riaa noise floor. It gets amplifyed along with the cart signal.
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