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60 cycle hum from Valve amp?

  • 15-08-2015 03:11PM
    #1
    Ross Mc
    Registered Users, Registered Users 2 Posts: 202 ✭✭


    Hey I have a Marshall Head and for some reason it has a 60 cycle hum on the clean channel all the time.

    There is no hum on the dirty channels, just on the clean.

    I have a guitar that coil splits so I have tested it. On the clean channel you can't noticed the 60 cycle hum when I switch the single coils but you can on the dirty channels. My guess is that there's a 60 cycle hum on the clean.

    It does also have some buzzes and odd sounds when I start the amp up

    Anybody have any idea what the problem could be?

    Oh also all the tubes are relatively new so shouldn't be a problem with them


Comments

  • #2
    feylya
    Moderators, Music Moderators Posts: 23,365 Mod ✭✭✭✭feylya


    Plug it into a different socket, preferably in a different building if possible. I'm guessing it's a motor on the same power circuit, possibly the fridge.


  • #3
    Ross Mc
    Registered Users, Registered Users 2 Posts: 202 ✭✭Ross Mc


    feylya wrote: »
    Plug it into a different socket, preferably in a different building if possible. I'm guessing it's a motor on the same power circuit, possibly the fridge.

    I'm doubting the fridge would be on the same circuit. I use my amp upstairs in my room and the fridge is downstairs in the kitchen.

    Also there was a time when my amp didn't have the hum at all, in the same circumstance.


  • #4
    Ravelleman
    Registered Users, Registered Users 2 Posts: 3,635 CMod ✭✭✭✭Ravelleman


    I had a similar problem with an ENGL many years ago. It turned out to be the bathroom light.


  • #5
    Dord
    Closed Accounts Posts: 10,815 ✭✭✭✭Dord


    It'd be 50hz hum here. :pac:

    I'd echo the suggestion of the others, try the amp in different rooms. Is the guitar properly shielded?
    Do you have another guitar to check?


  • #6
    Ross Mc
    Registered Users, Registered Users 2 Posts: 202 ✭✭Ross Mc


    Dord wrote: »
    It'd be 50hz hum here. :pac:

    I'd echo the suggestion of the others, try the amp in different rooms. Is the guitar properly shielded?
    Do you have another guitar to check?

    The guitar I have is an ESP Horizon so it's definitely correctly shielded. I have checked in the past and I'd be pretty annoyed if it wasn't to be honest.

    There is a chance it could be interference from my tv, I'm just going to uplug/switch off everything in my room just to be sure. If not I'll try it in another room.

    Could it be my cable causing the problem? I know I'm probably in need of replacing them anyway.


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  • #7
    Ross Mc
    Registered Users, Registered Users 2 Posts: 202 ✭✭Ross Mc


    After trying out a new pedal that I've acquired through a small practice amp I have, I may have stumbled upon the problem.

    The sound kept cutting out and as I suspected it was a dodgy cable. I needed a new one anyway so it's not a big deal. I'm hoping that is what was causing my buzz/hum through my Marshall.


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