Where to connect shielding - 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 29th March 2007, 09:18 PM   #1
diyAudio Member
 
Join Date: Apr 2006
Location: Utica
Default Where to connect shielding

Hi!
In the preamp section of my guitar amp there are several wires running from preamp tubes to gain pots and tone stacks, and back. The tubes are located at the back of the chassis and the pots are at the front panel, so some of these wires are relatively long and thus Iíve decided to replace them with shielded ones. The amp is star grounded and has local grounds for each preamp section. Most parts are point to point wired and are clustered around either the tubes or the tone stacks. I know that only one side of the shield is to be grounded and that the input wireís shield should be connected to the isolated input jackís ground which is then wired to the first stage local ground. How about the following stages thought?

Where is best to connect the shields of these long wires to:
1. the local star ground (which is usually closer to the tubes), or
2. the ground of a volume pot which is then run separately to the local star ground, or
3. the main preamp section local star ground, or
4. the main preamp section local star ground by a wire connected to say the middle (rather than the end) of the shielded wire, where part of the insulation could be stripped, or
5. the chassis?

Thanks and apologies for the newb questions. I did search but was unable to find anything specific enough on this.

V.
  Reply With Quote
Old 30th March 2007, 12:00 AM   #2
diyAudio Member
 
frank754's Avatar
 
Join Date: Jan 2007
Generally, these wires are by design far away from the output transformer & power supply, and in their own corner, shielding won't make a great deal of improvement.
If you do go that route, I would connect them to a bus or grounding scheme at the side where the pots are, rather than the tube end.
  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
Shielding ..... east electronics Solid State 9 20th July 2009 07:34 AM
Shielding Lostcause Everything Else 12 8th November 2005 02:30 PM
Shielding KornChild5 Everything Else 0 3rd May 2005 06:37 AM
RFI/EMI Shielding, is it necessary? mkruger Parts 1 22nd April 2004 05:54 AM
Shielding peterr Everything Else 2 17th September 2002 11:57 AM


New To Site? Need Help?

All times are GMT. The time now is 02:12 PM.


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