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Old 19th January 2013, 05:05 PM   #1161
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Tanks Frans.

One more thing to watch out for is cheapo cables on budget TT Like my Project RPM 4
The cheap and nasty phono plugs have no insulation so they are connected to ground with the metal of the cheap and nasty piece of metal so there is a potential loop there.

Best thing one can do is to replace the wires straight from cartridge tags to the phono plugs.

I use 4 wires in pairs (L and R) in their own silicon sleeve and 2 Layers of cooper braid over the top of those
The cooper braid is connected on TT end with the ground cable from the arm and on other end has a lug for the connection to the Phono star ground

Last edited by Bksabath; 19th January 2013 at 05:10 PM.
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Old 19th January 2013, 06:10 PM   #1162
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Bksabath View Post

I use 4 wires in pairs (L and R) in their own silicon sleeve and 2 Layers of cooper braid over the top of those
The cooper braid is connected on TT end with the ground cable from the arm and on other end has a lug for the connection to the Phono star ground
Did you rewire your tonearm ?
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Old 19th January 2013, 06:59 PM   #1163
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Yes I did a couple of years (maybe 4 or 5 ) back as I went Balanced INA with LT 1028
I am using single strand pure silver cores X 4.


Silver Insulated Wire Global Online Supplies - Product Line AG5494

This I have found is realy durable and light. Custom cables can be to heavy for same arms.

No broken wires at all while in use and abuse apart from solder joints.
Meybe I shuld have used the next size up

Last edited by Bksabath; 19th January 2013 at 07:03 PM.
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Old 19th January 2013, 07:32 PM   #1164
quan is offline quan  Australia
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Thanks guys for the interesting discussions re grounding rules. Thanks Franz for the ground scheme- now i understand it a bit more. I find that if i used screen IC the noise level is higher? May be the screen created a ground loop?.
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Old 19th January 2013, 07:44 PM   #1165
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Maybe the gnd on the rca sockets is touching the casework.
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Old 19th January 2013, 07:49 PM   #1166
FdW is offline FdW  Netherlands
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Originally Posted by sq225917 View Post
Maybe the gnd on the rca sockets is touching the casework.
This is an interesting point, the RCA connectors in and out should be mounted (any way that is what I prefer) on a Plexiglas insert (inserted into the back panel) to be sure that no (not any) signal or signal ground wire touches the chassis at that point!

Maybe this remark should be added to the builders guide

You just can see the insert (just) on this picture Balanced RIAA preamp | Flickr - Photo Sharing! it is on the outside
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Last edited by FdW; 19th January 2013 at 07:56 PM.
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Old 19th January 2013, 08:25 PM   #1167
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Quote:
Originally Posted by quan View Post
Thanks guys for the interesting discussions re grounding rules. Thanks Franz for the ground scheme- now i understand it a bit more. I find that if i used screen IC the noise level is higher? May be the screen created a ground loop?.
quan
Easy sorted just cut the screen wire from the Paradise board before it reaches the phono plug
If those are grounded on the enclosure you won't need the binding wire to TT
Snip away one at the time and listen for results
Easy to resolder them in place later.

Me think Neutric phono plugs came with 2 plastic washers, fiber washers EG one find in Plumbing water taps kits are even better just drill oversize holes...
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Old 19th January 2013, 08:38 PM   #1168
heinz1 is offline heinz1  Europe
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Quote:
Originally Posted by FdW View Post
...

Maybe this remark should be added to the builders guide
...
Another possibility:
May I suggest that somebody of the design/construction team opens a wiki page for the Paradise?

Main Page - diyAudio

The wiki pages here are somewhat neglected here, but I consider this format as very useful tool for summarizing information.

On that page, links to the most important posts could listed.
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Old 19th January 2013, 10:40 PM   #1169
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Me not on that team
AS Mrs Perrine wuld say I am Just Lollygagging along with my mouth hanging open.
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Old 20th January 2013, 02:53 AM   #1170
quan is offline quan  Australia
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Quote:
Originally Posted by FdW View Post
This is an interesting point, the RCA connectors in and out should be mounted (any way that is what I prefer) on a Plexiglas insert (inserted into the back panel) to be sure that no (not any) signal or signal ground wire touches the chassis at that point!

Maybe this remark should be added to the builders guide

You just can see the insert (just) on this picture Balanced RIAA preamp | Flickr - Photo Sharing! it is on the outside
Thank you Franz. How do you implement input resistor loading switches? Can you show me a close-up image?.
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