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

Instruments and Amps Everything that makes music, Especially including instrument amps.

Gibson Skylark Grouding Questions
Gibson Skylark Grouding Questions
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
Thread Tools Search this Thread
Old 23rd September 2005, 08:15 PM   #1
msmith1 is offline msmith1  United States
diyAudio Member
Join Date: Sep 2005
Question Gibson Sklark Grouding Questions

I just inherited a "vintage" Gibson Skylark GA5T Amp. It sounds pretty good but there is a definite hum and ... (this is the bad thing) when it is swithed off the metal and my guitar go hot! its a low voltage but definitly a tingle! Attached is a link to the schematics. I want to ground the chassis and I am checking for shorts. I probably need to install new isolated input jacks. What else do I need to watch for or is there a good reference. This is my first "project' amp. I am new at this so keep it simple, please. Thanks.http://www.harpamps.com/gibson/pg_0089.jpg
  Reply With Quote
Old 23rd September 2005, 10:07 PM   #2
Giaime is offline Giaime  Italy
diyAudio Member
Giaime's Avatar
Join Date: Oct 2004
Send a message via MSN to Giaime
It's easy that the 0.02uF capacitor in the primary of the power transformer is leaky or shorted. Remove it, it's not needed, and replace the power cord with an earthed one, 3-prong.

While you're here change all other capacitors.
  Reply With Quote
Old 23rd September 2005, 10:15 PM   #3
amperex is offline amperex  United States
diyAudio Member
Join Date: Feb 2005
Location: MI
Default Gibson amp

Although no leakage issues of line voltage, a new 3-prong cord replacing the stock two prong power cord removed all audio hum on our Gibson Hawk.
  Reply With Quote


Gibson Skylark Grouding QuestionsHide 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
60's Gibson 210 Redfoxfur Instruments and Amps 15 9th December 2014 06:55 AM
Gibson EH 150 restoration mattnorthrop Instruments and Amps 15 26th March 2009 09:09 AM
gibson amp lp JR jjac7212 Instruments and Amps 1 7th April 2008 01:55 PM
Need help cloning a Gibson g-20 amp DeadSpeaker Instruments and Amps 41 8th March 2008 09:37 PM
What is Gibson thinking? cyclotronguy Instruments and Amps 19 7th September 2005 08:57 AM

New To Site? Need Help?

All times are GMT. The time now is 11:45 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio