Mpp - Page 772 - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th November 2012, 03:41 AM   #7711
diyAudio Member
 
The Space Egg Corp's Avatar
 
Join Date: Sep 2010
Location: London & Miami
Blog Entries: 13
Smile The Plot Thickens.....

Here's an interesting plot...

Si.
Attached Images
File Type: gif 332_1K18_COMPARE.gif (15.5 KB, 334 views)
  Reply With Quote
Old 13th November 2012, 03:47 AM   #7712
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Could you share your circuit ?
  Reply With Quote
Old 13th November 2012, 11:21 AM   #7713
gk7 is offline gk7
diyAudio Member
 
Join Date: Oct 2007
Location: Vienna, Austria
A RIAA preemphasis test box using E48 resistor values:
Attached Images
File Type: jpg riaa_preemphasis.jpg (148.6 KB, 329 views)
  Reply With Quote
Old 13th November 2012, 12:09 PM   #7714
diyAudio Member
 
Bksabath's Avatar
 
Join Date: Dec 2007
Reverse RIAA is always going to be a compromise as long as we pick one to give consistent results across the pond I see no problem.

I am not going to fuss about 0.1 dB difference considering that before the sound get in to the groves it goes trough quite a lot of gadgets with loads of knobs (instrument tone controls mixing desk controls, pre-mastering "producer” tone controls master before cutting tone controls and here possibly a Newman pole that changes between each machine) then consider that each record came out at different times and was then tuned to the mass media typical sound system in use then ad this includes "gettoblasters"

So give me one that is easy to cook and stick to that. Algar did a lot of work so Hagerman is fine by me.

About Neumann pole Mr Neumann builds the lathes that cut your record to improve the reliability (arm breaking off and flying away) he added a resistor to make a further pole not all lathes have one and not all lathe have the same.
He himself was surprised by the use of his name for it.
Use it or not is a mater of taste but not a standard.
  Reply With Quote
Old 13th November 2012, 12:16 PM   #7715
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Mr. Neumann was long dead when Stereo records where introduced. Anyway, i think basically the same. Channel balance is more important then plus-minus 0.1dB RIAA precision, although that comes automatically with good channel balance. We have discussed this here anyway. Ricardo and Sampler came up with fine tunings of the Paradise with mathematical means that have shown that it can be set up with extremely good precision.
  Reply With Quote
Old 13th November 2012, 12:43 PM   #7716
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
Here is some information about the Neumann pole :Cut and Thrust: RIAA LP Equalization | Stereophile.com
  Reply With Quote
Old 18th November 2012, 06:27 PM   #7717
RCruz is offline RCruz  Switzerland
diyAudio Member
 
RCruz's Avatar
 
Join Date: Sep 2006
Location: Wallis
Blog Entries: 1
Default Paradise PSU

Quote:
Originally Posted by RCruz View Post
Hi

Can I use only one TX to feed two prereg psu´s to power the Paradise ?

I have one suitable TX that has double output windings and would like to minimize crosstalk using double bridges and caps, forming two psu´s.

I am afraid this might cause hum due to using the same TX secondaries to feed both bridges in parallel.
Following my initial quest about powering the Paradise with only one TX, I was lucky to get FdW full attention on the subect.

We have been working on this project in the backstage and finally agreed with a layout. I successfully built it and it works wonderfully. (One TX feeding double preregs to power both riaa boards independently and so got lower crosstalk from the raw psu).

During this work we also came up with a new grounding schematic for the riaa preamp and the TT that I believe can easily be implemented in any system.

I want to openly thank Frans for all the night work and inconditional support
__________________
RC
  Reply With Quote
Old 18th November 2012, 07:01 PM   #7718
pdul is offline pdul  Denmark
diyAudio Member
 
Join Date: Jan 2009
Location: Copenhagen
Are you posting the final result, in one of the paradise threads?
  Reply With Quote
Old 18th November 2012, 07:11 PM   #7719
diyAudio Member
 
Join Date: May 2008
Quote:
Originally Posted by gk7 View Post
A RIAA preemphasis test box using E48 resistor values:
Where does this scheme come from?
Thanks.
  Reply With Quote
Old 18th November 2012, 07:16 PM   #7720
FdW is offline FdW  Netherlands
diyAudio Member
 
FdW's Avatar
 
Join Date: Feb 2009
Location: Both feet on the ground (near Gouda)
Quote:
Originally Posted by pdul View Post
Are you posting the final result, in one of the paradise threads?
As soon as I have some time (to give it the proper attention) I will publish it in the Mpp thread (about halve way next week I think).
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 11:41 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2