Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Chassis wire
Chassis wire
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th November 2017, 09:45 PM   #31
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Some may have been copper-plated steel. Were you doing DC measurements? These won't necessarily tell you how good the cable is for video.
  Reply With Quote
Old 5th November 2017, 03:04 AM   #32
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
There are people that report a harsh mid frequency sound from silver plated copper Teflon insulated wire.

Another possible mechanism is frequency dependent “velocity of propagation”. Take a look at a couple of cable specifications. You will find that the “velocity of propagation” commonly will vary between 0.6 and 0.8 times the speed of light in a vacuum depending on the type of conductor and insulator.

I learned a couple of; new to me, things about silver plated copper Teflon insulated wire. Often the copper core is alloyed with other metals for greater tensile strength. Think about how much force can be applied when pulling a bundle of wire through a conduit. The silver plating that is applied to the copper core is much smoother than copper alone can be. The smooth silver surface has reduced resistance as the frequency increases.

See the Belden link a few posts back.

Testing may show frequency dependent group delay for silver plated copper Teflon insulated wire.

Speed of electricity flow (speed of current.)

DT
  Reply With Quote
Old 5th November 2017, 05:23 AM   #33
JMFahey is online now JMFahey  Argentina
diyAudio Member
 
JMFahey's Avatar
 
Join Date: Mar 2009
Location: Buenos Aires - Argentina
Quote:
There are people that report a harsh mid frequency sound from silver plated copper Teflon insulated wire.
Which means significative boost, at least a few dB at midrange frequencies, or at frequencies a couple octaves higher so they emphasize distortion or cable nonlinearity which actually *generates* an important level of distortion and annoying harmonics.
Any and all these variations on signal passing through suspect wire are easily measurable ... if existent that is ......

A parallel experiment would be a double blind one comparing perceived or stated harshness.
__________________
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
  Reply With Quote
Old 5th November 2017, 01:17 PM   #34
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by DualTriode
Another possible mechanism is frequency dependent “velocity of propagation”.
Very unlikely, given how short domestic audio cables are.

Quote:
Take a look at a couple of cable specifications. You will find that the “velocity of propagation” commonly will vary between 0.6 and 0.8 times the speed of light in a vacuum depending on the type of conductor and insulator.
No. That is for RF use of the cables, where the speed depends on the insulator - not the conductor. For audio the speed depends on the conductor, and it is much slower - yet still fast enough not to be an issue unless you are laying long-distance telephone cables.

Quote:
The smooth silver surface has reduced resistance as the frequency increases.
I think this effect comes into play at microwave frequencies and above?

You are grasping at straws to 'explain' a phenomenon which almost certainly does not even exist.
  Reply With Quote
Old 5th November 2017, 01:25 PM   #35
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
At microwave frequencies you are hard pressed to keep the signal IN a wire!
__________________
Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST
  Reply With Quote
Old 6th November 2017, 07:33 PM   #36
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Hello,

Seems that if there were harsh things going on in the midrange it would show up in a FFT.

I got out the basic QA401 analyzer, 3 resistors from the used junk bag and about 100 feet of 24AWG silver plated Teflon insulated wire. The resistors were all Vishay- Dale RN60…’s 1/2 watt metal film types; 300R, 267R and 10R. The silver plated 24AWG wire measures about 8R over the 100foot length.

I soldered the 300R and 10R in series and I soldered the 267R and the 8R wire in series.

Everything was put on the floor and tested in turn with the QA401. The big ball of wire acted as an antenna and picked up from the computer power supply. The signal output was placed over each of the series assemblies. The analyzer input was placed in turn over the 10R and then over the 8R wire. Technique borrowed from D Self’s small signal book.

Next try everything was tested inside an isolated steel junction box. Things cleaned up nicely.

There was nothing really notably different between the resistors in series and the similar value resistor is series with the 8R wire. There is nothing to see here.

DT
Attached Images
File Type: png silver wire.png (143.0 KB, 137 views)
File Type: png silver wire not.png (141.7 KB, 138 views)
  Reply With Quote
Old 7th November 2017, 10:57 AM   #37
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
All that is needed to get audio from here to there (a few metres away) is a reasonably good conductor surrounded by a reasonably good insulator. Metals are many orders of magnitude better conductors than we need for this task; air is many orders of magnitude better as an insulator than we need. Hence it is completely unsurprising that simple audio cables work (whatever metal or insulator they use), and only very cheap, very expensive and DIY cables fail to do this simple job
  Reply With Quote
Old 7th November 2017, 11:21 AM   #38
starkeyg is offline starkeyg
diyAudio Member
 
Join Date: Jan 2002
Location: Sourhern MI
So much angst over the years and not a single actual double blind test or real evidence that any of this can be audible by anyone. Theories by the dozen to rationalize a belief, but no actual evidence. Just sad.
  Reply With Quote
Old 8th November 2017, 04:43 PM   #39
Speedskater is offline Speedskater  United States
diyAudio Member
 
Speedskater's Avatar
 
Join Date: Sep 2002
Location: Lakewood, Ohio
Some silver wire to experiment with. And only $9000.
Everyday Objects ball of yarn in sterling silver. | Tiffany & Co.
__________________
Kevin
  Reply With Quote
Old 8th November 2017, 05:01 PM   #40
JeffYoung is offline JeffYoung  Ireland
diyAudio Member
 
JeffYoung's Avatar
 
Join Date: Jul 2017
Location: Ireland
Chassis wire
Quote:
Originally Posted by DF96 View Post
... and only very cheap, very expensive and DIY cables fail to do this simple job
Ha! Love it....
  Reply With Quote

Reply


Chassis wireHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Chassis Wire Sources wanders Parts 3 2nd May 2016 10:23 PM
FS: some extra Vampire Wire hookup/chassis wire cdfac Swap Meet 4 10th February 2013 06:16 AM
Hook-up/chassis wire EvilYoda Parts 4 8th August 2007 08:31 PM
magnet wire (not sure of the term) used as chassis wire? jarthel Parts 8 27th September 2006 09:50 PM
chassis wire Evaas Parts 6 17th February 2003 03:51 PM


New To Site? Need Help?

All times are GMT. The time now is 04:29 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki