Hi All,

I have a query about an amplifier I have just acquired, a second hand Roland Cube X20 . It’s in really good condition and all it’s features work fine but when I plug in the jack, before it’s connected to the guitar, I get a distinct hum. This almost disappears when I hold the the other end of the lead - except if I touch the jack tip – then it really screams.

The hum also almost disappears if I touch any metal part of the amp.

When it’s connected to the guitar the hum is still there but not so obvious when it’s being played.

I don’t know much about amps or electronics but I feel that the amp may have an earthing issue. Then again, it might be quite normal. This is my first experience with an amp so I really wouldn’t know.

Any help/suggestions would be greatly appreciated

Regards

Views: 102

Replies to This Discussion

Last time I had a similar problem like this, I went through all the grounds first. Meaning, the first ground was the output jack on the guitar. That fixed one situation. The next problem was the cord, I resoldered both plug heads on the cord I was using. And then the third problem was actually a wall Sounder joint on one of the points. If your shop has a chip in it, the chip might be bad. But going over all the grounds is the first step I have found, in most cases if the problem. It takes time to find to weak connection. Good luck

Easy steps first .  You may get alot of suggestions here ,  some involving taking the amp apart etc .. before you  try any of this , try plugging it into a different location in the house .(or extension cord to another outlet) many things can effect the amp . including  lighting and other outside influence .  a simple relocation may  be all it needs . 

Yes pick, all amps made in the last 30yrs are specifically made to not have grounding issues. with that said, check the obvious: Guitar wiring-pickups,switches,pots&output jack. Also check your cable, this is why people spend too much on cables-less money- problems, more money-less problems, cheap or failing cables make lots of noise! unscrew the ends & see if the wire has breaks- this is usually the cause? Check the outlet you are using- it may have a ground problem, this is why I always use a quality power strip & never straight in the outlet (pro tip) Lighting ballasts also make noise. Good luck, it doesn’t sound like you’ll need to take that amp apart, that’s a bad idea if you don’t know what you’re doing & could end up costing you to get it fixed? 

Since it's making a good bit of racket before the guitar is plugged in, I think your problem is the cord or amp jack being loose or bad ground connection at the jack. It's not uncommon to get a little noise in tube amps, but solid state shouldn't have that problem. So if the amp's jack is tight, try another cord before doing anything else.

Many thanks to all for their suggestions.   Yes, it was the cord.   A quick solder job and all is fine.

RSS

The Essential Pages

New to Cigar Box Nation? How to Play Cigar Box GuitarsFree Plans & How to Build Cigar Box GuitarsCigar Box Guitar Building BasicsCigar Box Guitar Parts Store

Site Sponsor

Recommended Links & Resources

Discussion Forum

Wickedbucker + Piezo +Volume Jack

Started by Adam Jellison. Last reply by Paul Craig yesterday. 7 Replies

Output method

Started by Holly Hodson. Last reply by KOOL DOG HOOCH Sep 22, 2019. 5 Replies

Creackle from Volume and Tone pots

Started by Arthur Payne. Last reply by KOOL DOG HOOCH Sep 22, 2019. 4 Replies

Dealing with hum...

Started by James Pobog. Last reply by KOOL DOG HOOCH Sep 22, 2019. 6 Replies

Copper foil tape as shield.

Started by Arthur Payne. Last reply by Arthur Payne May 2, 2019. 5 Replies

Why have a switch?

Started by Arthur Payne. Last reply by ILL GREEN Apr 12, 2019. 3 Replies

Problem with second-hand amp.

Started by Arthur Payne. Last reply by Arthur Payne Apr 2, 2019. 5 Replies

Added the CB Gitty “Psycho Knob”

Started by Tim Pannabecker. Last reply by Paul Craig Mar 8, 2019. 16 Replies

Lipstick pickup and Telecaster neck pickup. What goes where?

Started by Slow Blues Dani & Ol' Grey Bear. Last reply by Slow Blues Dani & Ol' Grey Bear Mar 1, 2019. 12 Replies

Wiring CB Gitty Black Ice Single Coil

Started by ILL GREEN. Last reply by ILL GREEN Jan 9, 2019. 5 Replies

Minimal effect from volume or tone pot

Started by Arthur Payne. Last reply by Paul Craig Dec 21, 2018. 9 Replies

Problem posting discussion

Started by Arthur Payne. Last reply by Paul Craig Dec 17, 2018. 2 Replies

Vol, tone, 3 way toggle and 2 single coils?

Started by Slow Blues Dani & Ol' Grey Bear. Last reply by Paul Craig Nov 25, 2018. 20 Replies

two picksups - both or separate

Started by Reynhard Boegl. Last reply by Reynhard Boegl Sep 27, 2017. 8 Replies

Psycho knob

Started by bizzaro guitaro. Last reply by bizzaro guitaro Sep 19, 2017. 4 Replies

Psycho knob install

Started by bizzaro guitaro. Last reply by bizzaro guitaro Sep 19, 2017. 13 Replies

Psycho knob

Started by bizzaro guitaro Sep 18, 2017. 0 Replies

I cheated and bought a solderless wiring harness. Naughty boy!

Started by Slow Blues Dani & Ol' Grey Bear. Last reply by Slow Blues Dani & Ol' Grey Bear Aug 18, 2017. 46 Replies

Capacitor

Started by Rose Ericson. Last reply by Rose Ericson Jul 8, 2017. 2 Replies

Blog Posts

Dual lap steel

Posted by Ron Lutz on January 9, 2020 at 2:42pm 1 Comment

My 3 Gitty Kits

Posted by Poorness Studios on January 8, 2020 at 9:20am 2 Comments

My CBG details

Posted by Paul scofield on January 1, 2020 at 9:22am 2 Comments

Latest Activity

Doug Krantz liked Ron Lutz's blog post Dual lap steel
3 minutes ago
David liked James Pobog's discussion fret (and fret marking) experiments
24 minutes ago
David liked James Pobog's discussion fret (and fret marking) experiments
24 minutes ago
Taffy Evans replied to Jeremy Wade's discussion Pickup for cigar box banjo
"Hi Jeremy, try adding a preamp to the pick up either on board or as  pedal. If you mounted one…"
32 minutes ago
Andries D. EKER commented on Andries D. EKER's video
Thumbnail

Barking Dogs at Night

"Thanks Keith ! ol well ! Thanks for the Like ! appriciated! !"
42 minutes ago
Andries D. EKER commented on Eero Tapani Lehtinen's video
Thumbnail

Diana cigarbox guitar

"Great Blues Eero ! nice little relic !!  you play some mean riffin ! Diana The Goddess of the…"
48 minutes ago
AGP # commented on Dave Lynas's video
Thumbnail

The Coo Coo

"Lovely Dave!, nice slow smooth version of a Clarence "Tom" Ashley Classic :-)"
52 minutes ago
Jeremy Wade posted a discussion

Pickup for cigar box banjo

I would like to build a cigar box banjo for my next build. I’ve seen people place small tambourines…See More
56 minutes ago
AGP # liked Dave Lynas's video
56 minutes ago
Andries D. EKER commented on Andries D. EKER's video
Thumbnail

Barking Dogs at Night

"Thanks Eero ! for your kind Comments !! appriciated !"
57 minutes ago
Andries D. EKER commented on Andries D. EKER's video
Thumbnail

Barking Dogs at Night

"Great picture Alan ! Thanks !!"
58 minutes ago
Andries D. EKER commented on Andries D. EKER's video
Thumbnail

Barking Dogs at Night

"Oke Uj good advice Gave Jack a hand tonight ,but not to many ,got a long drive tomorrow ,my oldest…"
59 minutes ago

Music

Loading…

© 2020   Created by Ben "C. B. Gitty" Baker.   Powered by

Badges  |  Report an Issue  |  Terms of Service

\uastyle>\ud/** Scrollup **/\ud.scrollup {\ud background: url("https://storage.ning.com/topology/rest/1.0/file/get/963882636?profile=original") no-repeat scroll 0 0 transparent;\ud bottom: 25px;\ud display: inline !important;\ud height: 40px;\ud opacity: 0.3 !important;\ud position: fixed;\ud right: 30px;\ud text-indent: -9999px;\ud width: 40px;\ud z-index: 999;\ud}\ud.scrollup:hover {\ud opacity:0.99!important;\ud}\ud \uascript type="text/javascript">\ud x$(document).ready(function(){\ud x$(window).scroll(function(){\ud if (x$(this).scrollTop() > 100) {\ud x$('.scrollup').fadeIn();\ud } else {\ud x$('.scrollup').fadeOut();\ud }\ud });\ud x$('.scrollup').click(function(){\ud x$("html, body").animate({ scrollTop: 0 }, 600);\ud return false;\ud });\ud });\ud \ua!-- End Scroll Up -->