Retro - A fully symetrical phono stage with RIAA filter - Page 14 - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Twisted Pear

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools Search this Thread
Old 7th January 2013, 11:32 PM   #131
diyAudio Member
 
Join Date: Jan 2008
Talking Retro lives

I've been running the placid voltage at 15 and shunting 90ma to power the retro. Any advise or is this ok? Gain is lower than the Buffalo/legato when using the soundsmith retipped demon dl-103r. The preamp is at about 2 o'clock with the retro whereas it is at about 10 o'clock with buffalo. Its fine but lower in output. Sounding very good.
  Reply With Quote
Old 8th January 2013, 12:36 AM   #132
diyAudio Member
 
BrianDonegan's Avatar
 
Join Date: Dec 2004
Location: TPA HQ
Cool.

Last night I dug out my old B&O and dissected it to see what had to be done to use the coils balanced (no ground connection). Turns out, I don't have to do anything. The RCA outputs are connected to the two ends of the coil, no ground, apart from the chassis ground wire. I will get a pair of Retros running tomorrow (at long last).
__________________
Twisted Pear Audio
  Reply With Quote
Old 8th January 2013, 12:55 AM   #133
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Quote:
Originally Posted by bikerboy View Post
I've been running the placid voltage at 15 and shunting 90ma to power the retro. Any advise or is this ok? Gain is lower than the Buffalo/legato when using the soundsmith retipped demon dl-103r. The preamp is at about 2 o'clock with the retro whereas it is at about 10 o'clock with buffalo. Its fine but lower in output. Sounding very good.
Perfectly fine As long as the voltage is not sagging.

Very pleased you are enjoying it.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 8th January 2013, 02:20 AM   #134
diyAudio Member
 
Join Date: Jul 2005
Location: North IL
Quote:
Originally Posted by bikerboy View Post
...... The preamp is at about 2 o'clock with the retro whereas it is at about 10 o'clock with buffalo.
Kewl! I love vinyl!

Yeah, them .3mV cart's need some boost! I like around 60-68dB gain with the low outputs.

I stuck my 103r in an aluminum body. It is made by one of the Lenco forum guys in Hong Kong. I'll planning to try a Ruby Cantilever upgrade from Soundsmith after my Dyna 17D3 wears out.

Click the image to open in full size.
  Reply With Quote
Old 7th February 2013, 02:01 AM   #135
diyAudio Member
 
BrianDonegan's Avatar
 
Join Date: Dec 2004
Location: TPA HQ
Kits are available now: Retro - Balanced RIAA Stage
__________________
Twisted Pear Audio
  Reply With Quote
Old 7th February 2013, 11:54 PM   #136
diyAudio Member
 
Join Date: Jul 2006
Hi Brian, Is this kit for MC but not MM cartridge?
  Reply With Quote
Old 7th February 2013, 11:56 PM   #137
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
It will actually work well for either.

If you use MC it should be the higher output type.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 9th February 2013, 06:05 PM   #138
benpe is offline benpe  Poland
diyAudio Member
 
Join Date: Apr 2007
I went thru all thread and there is something for me that needs clarifying: input load.
Retro - A fully symetrical phono stage with RIAA filter
Posts #86 and #87.
What is the actual load ? 47k or 94k ? Do we need to place this resistance to ground or between cartridge signal ?
On the other hand - how to setup like 70dB gain ?
  Reply With Quote
Old 10th February 2013, 11:22 PM   #139
diyAudio Member
 
BrianDonegan's Avatar
 
Join Date: Dec 2004
Location: TPA HQ
Here is a picture of the kit boards and parts. On board is upside-down to show the op-amps etc.
Attached Images
File Type: jpg DSC_0024-002.JPG (188.4 KB, 435 views)
__________________
Twisted Pear Audio
  Reply With Quote
Old 12th February 2013, 06:03 PM   #140
Nisbeth is offline Nisbeth  Denmark
diyAudio Member
 
Nisbeth's Avatar
 
Join Date: Jan 2001
Location: Denmark
Boards now en route

Question: Is there any reason for using 21R resistors on the output and not 22R/22R1?

/U.
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
RIAA Phono Amp Design Sheldon Tubes / Valves 51 24th December 2007 06:45 PM
how build usb phono pre riaa tekton364 Analogue Source 2 28th September 2007 08:50 PM
WTB: RIAA Phono Stage mrdon Swap Meet 1 19th July 2007 04:00 AM
RIAA phono stage KevinTams Tubes / Valves 10 16th May 2005 01:05 PM
ls-37 MM/MC RIAA Phono Amp from diyclub.biz wuffer Tubes / Valves 2 13th November 2004 04:12 PM


New To Site? Need Help?

All times are GMT. The time now is 01:35 AM.


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