Fluctuating volume on tubes

Discussion in 'Amps [BG]' started by belaxa, May 16, 2008.


  1. belaxa

    belaxa

    Joined:
    Oct 23, 2007
    Location:
    La Plata, Argentina
    What can be the cause to make a tube amp mo make the volume level up and down? The Fender Studio Bass that I am buying have this issue. The amp was unplugged for years.
  2. Bassmec

    Bassmec

    Joined:
    May 9, 2008
    Location:
    Ipswich UK
    Disclosures:
    Proprietor Springvale Studios
    Damaged or dirty potentometers.
    DRY Joints (soldering imperfections you ****ing hippies)
    Failing power supply caps, Loose damaged dirty bias presets,
    A combination of some or all of the above.
    :bassist:
  3. christw

    christw Get low!

    Joined:
    May 11, 2008
    Location:
    Dayton OH
    Disclosures:
    Endorsing: J Worrell Bass
    Loose tubes too. My brother's Champ had that problem. The socket was a bit loose for the tube... (No jokes, please!) He bent it back into shape and no problems since.
  4. Bassmec

    Bassmec

    Joined:
    May 9, 2008
    Location:
    Ipswich UK
    Disclosures:
    Proprietor Springvale Studios
    Tubes is what you get toothpaste in Chap! Thermionic Valves go in radio sets and amplifiers, i'll have you know. and they are not sockets, Sockets can be readily found on the front and rear panels, they are Valve bases,
    repeat Valve bases.
    You say tomato I say tomato
    Bollocks! We invented them so we know what there called right.
    Christ we only lent you the language a couple of hundred years ago
    and there you go busking it and improvising it all over the shop.
    You chaps have worn the arse out of it, hardly recognize the old thing any more.
    And another thing elephants have trunks, motor cars have boots.
    they also have bonnets bumpers and mudguards, fire places in stately homes often have fenders mind you.
    Oh well I spose we can give you colonial chaps a couple of hundred more years to revise and see how you do with the old lingo then eh!
    Toodle Pip Fairfax
    :bassist:
  5. fdeck

    fdeck Supporting Member

    Joined:
    Mar 20, 2004
    Location:
    Madison WI
    Disclosures:
    HPF Technology: Protecting the Pocket since 2007
    These are all good recommendations. The bottom line is that the tubes themselves should be regarded as the least likely culprits, at least until you have ruled out things that are much cheaper to fix.
  6. Psycho Bass Guy

    Psycho Bass Guy

    Joined:
    Mar 9, 2000
    Location:
    The hills of Tennessee
    Typical British posturing: you need a refresher course in history. While therminonic valve or emitter may more accurately describe what they do, we call them vacuum tubes. We beat you in two wars and you begged for OUR help in the last two global conflicts, so don't go getting all high and imperially mighty. Is that the sunset I see?
  7. bassmodder

    bassmodder

    Joined:
    Dec 9, 2006
    Location:
    Sioux Falls, SD
  8. xsubs

    xsubs Working Class Hero Supporting Member

    Joined:
    Jul 15, 2007
    Location:
    NYC & Corcaigh, Éire
    Fireplace is one word... even in the UK :smug:
  9. JimmyM

    JimmyM Supporting Member

    Joined:
    Apr 11, 2005
    Location:
    Apopka, FL
    Disclosures:
    Endorsing: Ampeg Amps, EMG Pickups
    Oh snap!
  10. Bassmec

    Bassmec

    Joined:
    May 9, 2008
    Location:
    Ipswich UK
    Disclosures:
    Proprietor Springvale Studios
    Check out a couple of our new inventions, British of course.
    First here is my design for a simple modification for making a bergatino
    1x12 cab sound like an SVT:
    [​IMG]
    Also a handy little British designed device for making it just as easy to handle a heavy cabinet as a light one:
    [​IMG]
    Damn clever What!
    Toodle Pip! Fairfax
    :bassist:
  11. belaxa

    belaxa

    Joined:
    Oct 23, 2007
    Location:
    La Plata, Argentina
    JUAJAJJJJAJa
  12. bassbrock

    bassbrock

    Joined:
    Feb 20, 2007
    Location:
    Callahan, FL
    I think the issue is that you need to change your battery.
  13. dystopiate

    dystopiate

    Joined:
    Feb 21, 2008
    Location:
    New York City
    Disclosures:
    Endorsing Artist: Spector, Aguilar
    I just unearthed an old combo with the same problem. Contact cleaner fixed it up.

    If that's the problem, it's a cheap fix. If not, you'll probably need the cleaner for something else sooner or later. I think it's probable because you haven't used it for years, so corrosion seems more likely than some serious damage.

    Spray a small amount on the knobs/pots, inputs, etc. Move them around. Hopefully that'll be all you need.
  14. Kelly Lee

    Kelly Lee Yeah, I'm a guy! Supporting Member

    Joined:
    Feb 17, 2004
    Media:
    1
    Location:
    Marana, AZ, USA
    OK, I have reinstated the posts in question.

    One point I would like to strongly emphasize, please make yourself aware of Rule#5 here at Talkbass.

    Have a nice day. :)
  15. Psycho Bass Guy

    Psycho Bass Guy

    Joined:
    Mar 9, 2000
    Location:
    The hills of Tennessee
    You brought it up for discussion in the thread, so I don't think it's unreasonable that we commented on it. Nobody questioned your authority; we just wondered if you got the joke. :ninja:
  16. Kelly Lee

    Kelly Lee Yeah, I'm a guy! Supporting Member

    Joined:
    Feb 17, 2004
    Media:
    1
    Location:
    Marana, AZ, USA
    PBG, yeah, I got that his post was in jest. However, I wasn't too sure about yours. Just please use some smilies in the future. M'kay? :cool:
  17. JimmyM

    JimmyM Supporting Member

    Joined:
    Apr 11, 2005
    Location:
    Apopka, FL
    Disclosures:
    Endorsing: Ampeg Amps, EMG Pickups
    Now I remember this thread...yeah, this was the funniest thread I've seen in a while! I love those pics Bassmec posted. I especially like the little metal lightning bolt pieces placed around the earhole on the Bergantino mod. Are they there to direct the soundwaves directly into the earhole? Very state of the fart...er...art.
  18. johnk_10

    johnk_10 vintage bass nut Supporting Member

    Joined:
    Feb 16, 2008
    Location:
    Thousand Oaks, CA
    Disclosures:
    John K Custom Basses
    HEEEEE HEEEEE, HAW, HAW Hardy har har!!!! ROFL. that is the funniest thing i've read on here yet!


    johnk

Share This Page