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Amp runs for 30 seconds, then slowly dies

Discussion in 'Amps and Cabs' started by pine, May 17, 2011.

  1. pine

    pine Silver Supporting Member

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    I have a 5E3 clone that has worked well for years, but now, I power it up, it plays for 30 seconds or so, then it gets fainter and fainter until there is no sound. I thought it might be a loose connection that was interrupting the circuit when it got hot enough, so I re-flowed every joint I could find, but of course the problem is still there. Now I'm thinking it is a component failure. Has anyone seen these symptoms before, or know what the problem might be?
     
  2. XmasTree

    XmasTree Member

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    perhaps the rectifier tube?
     
  3. theroan

    theroan Member

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  4. Blanket Jackson

    Blanket Jackson ¿Qué Hiciste? Silver Supporting Member

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    Funny, my ex-wife used to say that was my problem too

    I'll be here all week. Try the veal.
     
  5. gixxerrock

    gixxerrock Member

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    I had that exact thing on an old Marshall, replaced the 35 year old caps and it runs great! Powertubes sometimes fail with the same symptoms.
     
  6. ripley156

    ripley156 Supporting Member

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    I had a v2 preamp tube that died for both sides that did the same thing
     
  7. Peteyvee

    Peteyvee Premium Platinum Member

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    And to thoroughly confuse the OP, I had the exact same symptoms on a JTM45RI and it was the PT slowly dying. One day it blew a HT fuse and that was it. I'd take it to a good tech unless you know what you're doing. Tube swaps (like the rectifier tube) would also be a good place to start.
     
  8. schmidlin

    schmidlin Member

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    If you feel qualified, I would start checking voltages. Something is off somewhere.

    And check for caps getting hot on their own.
     
  9. tnt365

    tnt365 Supporting Member

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    Same thing was happening to my amp and turns out the speaker was blown! Check the speaker cone. Also it could be a power tube, possibly a rectifier tube. good luck!
     
  10. gixxerrock

    gixxerrock Member

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    Unless you know what you are doing, do not touch any caps inside your amp! The big ones pack a punch, even if amp is unplugged.
     
  11. lkft

    lkft Member

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    Find yourself a reputable tech and have him/her look at it...not worth getting electrocuted probing around in there yourself unless you know what you're doing. Seems that it should be an easy fix though, Good Luck!
     
  12. shg

    shg Senior Member

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    Yeah, check the caps. And by that I mean get electrocuted and die.
     

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