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February 24, 2020, 07:31:43 PM

Author Topic: Shielded Bottlehead Power Cord, With Pictures  (Read 15558 times)

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Offline Grainger49

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Re: Shielded Bottlehead Power Cord, With Pictures
« Reply #30 on: May 07, 2012, 12:45:06 AM »
In 1984 I installed a computer room and process data acquisition computer. an IBM Mainframe.  Things have changed since then.  

I do remember using the isolated "noise free" ground in that room  But nothing special about the power cabling.  I do not remember if there were any IEC power cords or if they were attached.

If there are any other questions about power cord grounding and shielding we should start another thread.  This has morphed beyond a construction thread. 
« Last Edit: May 07, 2012, 04:48:15 AM by Grainger49 »

Offline Yoder

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Re: Shielded Bottlehead Power Cord, With Pictures
« Reply #31 on: July 21, 2012, 11:19:38 AM »
I just finished a shielded C7 cable for my Mac mini. I used a Furutech plug and C7. I had to do some major mods to the C7, which meant stripping it down completely. The cable is basically the same as yours though i just used three pieces of 16 gauge wire. One of the pieces was used solely as a "filler." I did not braid or twist the wire, but just laid it down straight, wrapped it in teflon tape, and then pulled the tinned copper sleeving over it. I soldered a ground to the tinned copper and grounded it to the AC plug just as you did.

The C7 was the tough part. The first one I got was defective and so they sent me a new one. I was going to use some PVC pipe, but instead used a cap from a bottle of guitar polish. After stripping off the C7 parts, taking a Dremel to it, and protecting the bare pieces with heat shrink; I put a little bit of hot glue on it to keep things from moving. I then put the "Dunlop" cap on, filled it with hot glue, and added the heat shrink. It made a considerable difference in the sound and I was able to do it for about 40% of the costs of a manufactured cable using the same components...minus the "Dunlop" cap.

The C7 Cable
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fwww.co-bw.com%2FImages_DIY_New%2FFur_Cable.jpg&hash=a3c83451c00edf30591c7d261a9524d6)

The Hardware
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fwww.co-bw.com%2FImages_DIY_New%2FFur_Cable_2.jpg&hash=0a55926a19e339076bd995ca30b40bf3)

Modified C7
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fwww.co-bw.com%2FImages_DIY_New%2FFur_C7_Adapter.jpg&hash=4cc2aacc543cfa05c53109a6bc63ef4d)

Source of the Cap
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fwww.co-bw.com%2FImages_DIY_New%2FFur_Dunlop_Bot.jpg&hash=9ada0bcae116e712f46372f3c6a97dfc)

The cap before cutting a hole in the top
(https://forum.bottlehead.com/proxy.php?request=http%3A%2F%2Fwww.co-bw.com%2FImages_DIY_New%2FFur_Dun_Cap.jpg&hash=b35a8f9e06f8376b7e877ac5df6dd885)



Offline Grainger49

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Re: Shielded Bottlehead Power Cord, With Pictures
« Reply #32 on: July 21, 2012, 01:31:53 PM »
Nice work.  Is the Dunlop cap at the C7 end around the wires coming out of the C7? 

Offline Yoder

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Re: Shielded Bottlehead Power Cord, With Pictures
« Reply #33 on: July 21, 2012, 03:46:44 PM »
Yup. The Dunlop carnauba wax is also great for polishing the BH bases.