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Twisted Pear Superior quality electronic kits

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Old 3rd September 2010, 07:48 AM   #111
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Bump.... I need a new phono stage. When can we expect to purchase the Retro?

Bill
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Old 3rd September 2010, 04:37 PM   #112
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Default RIP - retro

I'm not normally one to just jump up and say a project is buried and gone, but this one's not seen any active responses in quite a long time.

Russ' last response was in May, and that wasn't even on topic. Though I'm sure he may get back around to this someday.

I recommend checking out the new pearl 2 article from Wayne and Nelson over in the pass labs forum. The article itself was just published on passdiy.com so you can check it out and see if you're interested. (the price ended up a little steep for the PCB's, but that's your choice)

On the opamp side of things I am currently very happy with my ESP phono board. I used one of Russ and Brian's Placid BP's for the power supply and it sounds fabulous. (the preamp board is ESP project 6, and the project 99 rumble filter)

-Chris
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Old 17th September 2010, 03:06 PM   #113
jason12 is offline jason12  United States
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Let me ask a stupid question. If the resistor values between upper half and lower half differ let's say 2% - will it result in 2% harmonic distortion?
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Old 17th September 2010, 03:24 PM   #114
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We have a few PCBs. Contact Brian if you want one.

I will get more if there is interest.

Cheers!
Russ
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Last edited by Russ White; 17th September 2010 at 04:37 PM.
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Old 17th September 2010, 03:25 PM   #115
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Quote:
Originally Posted by jason12 View Post
Let me ask a stupid question. If the resistor values between upper half and lower half differ let's say 2% - will it result in 2% harmonic distortion?
No, just slightly less common mode rejection. Maybe a very slight increase in distortion. Nothing close to 2%
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Old 6th February 2011, 06:45 PM   #116
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Default Retro BOM

Hi,
I got a pair of boards from Brian and am getting the parts order together. Am I on the right track with the ICs ? I am not an expert so if there are better parts I can get please let me know. I am basing this bom on available parts. I will be ordering from Digikey and mouser to get all the needed parts. If I need to substitute anything better can someone give a hand? I am including parts for several gain levels. I am building a retro for my soundsmith low output denon dl103r. I still need to order 2 placid BP ps from TPA.
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File Type: pdf RETRO order.pdf (92.9 KB, 164 views)
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Old 22nd February 2011, 02:08 AM   #117
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Sorry I did not notice this earlier. I will look at the circuit soon. It has been a while since I have visited this project.
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Old 22nd February 2011, 02:14 PM   #118
sek is offline sek  Germany
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Quote:
Originally Posted by Russ White View Post
It has been a while since I have visited this project.
Yes, we noticed.
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Old 6th March 2011, 11:17 PM   #119
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Default Retro out of hibernation

I have the Retro boards done. Need to build the pair of Placids to power them and fire them up. Had some trouble with the parts and Brian and Russ helped me out. My BOM is wrong! I needed opa 1632, not opa 1623! Had a hard time finding small .22 uf caps. So the caps are not mounted as close as I would like. Hope to have it running today!
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File Type: jpg Retro-1.jpg (78.8 KB, 531 views)
File Type: jpg Retro-2.jpg (78.9 KB, 526 views)
File Type: jpg Retro-3.jpg (78.7 KB, 517 views)
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Old 6th March 2011, 11:20 PM   #120
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Excellent news! I truly hope it works well for you.
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