Retro - A fully symetrical phono stage with RIAA filter - Page 14

bikerboy · 7th January 2013, 11:32 PM

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.

BrianDonegan · 8th January 2013, 12:36 AM

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).

Russ White · 8th January 2013, 12:55 AM

Quote:

Originally Posted by bikerboy

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.

SCompRacer · 8th January 2013, 02:20 AM

Quote:

Originally Posted by bikerboy

...... 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.

BrianDonegan · 7th February 2013, 02:01 AM

Kits are available now: Retro - Balanced RIAA Stage

goodwill · 7th February 2013, 11:54 PM

Hi Brian, Is this kit for MC but not MM cartridge?

Russ White · 7th February 2013, 11:56 PM

It will actually work well for either.

If you use MC it should be the higher output type.

benpe · 9th February 2013, 06:05 PM

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 ?

BrianDonegan · 10th February 2013, 11:22 PM

Here is a picture of the kit boards and parts. On board is upside-down to show the op-amps etc.

Nisbeth · 12th February 2013, 06:03 PM

Boards now en route

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

/U.

7th January 2013, 11:32 PM	#131
bikerboy diyAudio Member Join Date: Jan 2008	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.

8th January 2013, 12:36 AM	#132
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	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

7th February 2013, 02:01 AM	#135
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	Kits are available now: Retro - Balanced RIAA Stage __________________ Twisted Pear Audio

7th February 2013, 11:56 PM	#137
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	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.

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7th February 2013, 11:54 PM	#136
goodwill diyAudio Member Join Date: Jul 2006	Hi Brian, Is this kit for MC but not MM cartridge?

9th February 2013, 06:05 PM	#138
benpe 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 ?

12th February 2013, 06:03 PM	#140
Nisbeth diyAudio Member 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.

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