Screened cable for rewiring valve amp - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 2nd February 2013, 11:14 AM   #1
diyAudio Member
 
Join Date: Feb 2010
Location: London
Default Screened cable for rewiring valve amp

Hello,
I wish to upgrade the signal cable inside my Yaquin MC-10L tube amp. Contacted Chord Co who said they don't supply cable off the reel, but recommended:

"silver-plated cable with PTFE insulation and ideally a two layer foil and braid shield"

Any cable suggestions welcome, want this to make a worthwhile sonic improvement

Thanks
  Reply With Quote
Old 2nd February 2013, 11:27 AM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
That's a nice recommendation if you like risking triboelectric noise.

What is the deficiency in the wire that's in there already? Is this wire already contained within a grounded metal chassis?
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 2nd February 2013, 11:44 AM   #3
diyAudio Member
 
Join Date: Feb 2010
Location: London
Hello and thanks for your message,

Here is a pic of the input wire (Black 2 core) on the right going to the preamp board and the yellow arrows pointing where it changes to 3 core when feeds the EL34s


Click the image to open in full size.
  Reply With Quote
Old 2nd February 2013, 12:04 PM   #4
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
But how have you determined that the wire is limiting the performance and in what way is it causing problems? If you don't have a clear idea of what you're trying to fix, it's unlikely that throwing random solutions (especially recommendations by salesmen) at the problem will solve it.

If you want to make sonic improvements to the amp, it's best to figure out what the deficiencies are, then attack the root causes- usually design, layout, and grounding issues for Chinese amps. Wire is generally pretty far down the list.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 2nd February 2013, 12:10 PM   #5
diyAudio Member
 
Join Date: Feb 2010
Location: London
I've changed the amp's caps to wonderful effect, little in outlay and catapults the amp into a different league. Rolled the valves too which made a subtle but nice improvement. Tried a few different interconnects and this made me think the internal signal wire maybe sonically crap ?
  Reply With Quote
Old 2nd February 2013, 12:19 PM   #6
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Post a schematic and then let's talk. If changing caps made a huge difference, that suggests that there are some serious design flaws.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 2nd February 2013, 12:24 PM   #7
diyAudio Member
 
Join Date: Feb 2010
Location: London
Ok thanks, interesting Will try and get a schematic. there is a group here for the amp:

Yaqin mc10L
  Reply With Quote
Old 2nd February 2013, 12:37 PM   #8
diyAudio Member
 
Join Date: Feb 2010
Location: London
Also plan to bypass the input selector as don't need it and replace the vol pot with a stepped one
  Reply With Quote
Old 2nd February 2013, 12:43 PM   #9
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Quote:
Here is a pic of the input wire (Black 2 core) on the right going to the preamp board and the yellow arrows pointing where it changes to 3 core when feeds the EL34s
Connecting a shield (screen) at only 1 end is correct technique. The idea is to dump noise into the chassis. The 2 conductors inside the cable carry the signal.

Discriminate between signal ground (earth) and chassis ground.
__________________
Eli D.
  Reply With Quote
Old 2nd February 2013, 01:14 PM   #10
diyAudio Member
 
Join Date: Feb 2010
Location: London
Thanks Eli D

The schematic:

Click the image to open in full size.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with AC cable rewiring please Fred75 Solid State 4 18th April 2011 02:19 AM
Miniature lap screened cable in twin format sbrook Parts 0 1st March 2007 08:05 PM
Miniature lap screened cable in twin format sbrook Vendor's Bazaar 0 25th February 2007 09:09 PM
screened cable and shielded E88CC jerome Tubes / Valves 2 5th December 2002 03:02 PM


New To Site? Need Help?

All times are GMT. The time now is 01:03 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2