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Blew fuse

Discussion in 'Amp Tech Center' started by golfnut, Jan 12, 2019 at 9:31 PM.

  1. golfnut

    golfnut Friend of Leo's

    Age:
    58
    Jan 15, 2008
    Canada
    Blew a fuse in my amp tonight. Will have to wait till tomorrow to replace. If it blows again could possibly be rec tube. Is there any chance it could be more serious?
     
  2. uriah1

    uriah1 Doctor of Teleocity Ad Free Member

    Feb 12, 2011
    Around
    Ya rectifier but I had a bad pi tube take out a res and a fuse
     
  3. dan1952

    dan1952 Friend of Leo's

    Age:
    66
    Jun 24, 2004
    Anderson, IN
    There are so many possibilities that it is pointless to speculate.
     
    BobbyZ likes this.
  4. corliss1

    corliss1 Friend of Leo's Platinum Supporter

    Sep 13, 2008
    Lansing, MI
    This. If a new fuse blows again, you can try swapping tubes, but it's likely tech time.
     
    dan1952 likes this.
  5. golfnut

    golfnut Friend of Leo's

    Age:
    58
    Jan 15, 2008
    Canada
    Is there any chance the fuse just wore out?
     
  6. corliss1

    corliss1 Friend of Leo's Platinum Supporter

    Sep 13, 2008
    Lansing, MI
    Yup - only way to know is to put in another one and see what happens. If it blows again, you'll know it wasn't a case of "worn out"
     
  7. schmee

    schmee Friend of Leo's

    Jun 2, 2003
    northwest
    Could be just a coincidence/use blew.
    Make sure you use a slo blo fuse
    -Rectifier could be bad
    -On/off switch can blow a fuse if the contacts in the switch are dirty. Does it "pop" when you turn it on?
    -Power tube could be bad.
    -A ton of possible reasons but those are often the likely ones.
     
  8. Ringo

    Ringo Poster Extraordinaire

    Mar 16, 2003
    Memphis TN
    As mentioned a lot of possible reasons, what kind of amp? is it old? has it ever been serviced? A bad rectifier tube can do that , if you have another one you could try that , OR it could be something else.
     
  9. Blue Bill

    Blue Bill Poster Extraordinaire Ad Free Member

    Feb 15, 2014
    Maine
    Equipment blows up in order to protect the fuse.
     
  10. Blrfl

    Blrfl Tele-Meister

    232
    May 3, 2018
    Northern Virginia
    I'll pass on starting another thread about wiring wearing out in vintage amps and messing up their mojo.
     
  11. Milspec

    Milspec Friend of Leo's

    Feb 15, 2016
    Nebraska
    I am pretty cautious with such things, so if the tube blew and it hasn't been serviced in a few years, I would take it to a tech instead of fuse replacement and try again. The fuse blows to protect the expensive stuff so I don't want to give it a second chance to damage something.
     
  12. dan1952

    dan1952 Friend of Leo's

    Age:
    66
    Jun 24, 2004
    Anderson, IN
     
    Blue Bill likes this.
  13. golfnut

    golfnut Friend of Leo's

    Age:
    58
    Jan 15, 2008
    Canada
    I put a new fuse in and it blew right away. I changed the rec tube, put another fuse in and it went for my whole first set today and still going. Got a couple more sets to go. This is the last time I spend lots of money on NOS tubes. Was aMullard that cost me a fair bit and lasted 6 months. Just have the cheap sovtek in there now
     
    robrob likes this.
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