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Amp whistling...

Discussion in 'Amp Input - Normal or Bright' started by Gautier30, Feb 4, 2018.

  1. Gautier30

    Gautier30 Strat-Talk Member

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    Hi guys,

    My girl's father has a Bassman 100 silverface from the 70's I think, and it whistles after playing a bit... The amp was repaired last month and after getting it back it still does this noise. Here is a short sample of what we've got : https://streamable.com/4r48w

    The first time this happened, the amp was really hot in the tubes area, this time, after the repair, it's not so hot, but it does this loud whistle noise anyways... We tried other cables, other bass guitar... Nothing seems to fix it... That's why I'm asking your help Ahah ^^

    Thank you
     
  2. himijendrix

    himijendrix Senior Stratmaster

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    New tubes?
     
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  3. Gautier30

    Gautier30 Strat-Talk Member

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    The tubes have been replaced not so long ago
     
  4. Ronkirn

    Ronkirn Most Honored Senior Member

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    to be honest, no one will be able to diagnose an electronic issue by watching a video, you will have to take it to a tech for a proper repair... You CAN just start replacing "stuff" that is user accessible, but you can wind up spending more $$ because you're replacing stuff that's perfectly good.

    Could be a "microphonic" anything ... like a transformer...

    I know a bit about electronics.. but i still take my high end electronics to a specialist. Get a tech, get it fixed right... Nice amp.. it deserves it...

    Ron Kirn
     
  5. Gautier30

    Gautier30 Strat-Talk Member

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    You're right but I thought that some of you could recognize an issue they already encountered. The fact is that the amp was sent to the tech of our local guitar and amp store and the guy took weeks to finally find nothing and replace stuff "just in case"...
     
  6. Ronkirn

    Ronkirn Most Honored Senior Member

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    Well there's "techs" and then there's Techs. The first can find a burnt resistor, a faulty cap or bad tube, by poking around.. the second analyzes the problems and does the necessary "brain surgery" to get it back to "like new"..
     
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  7. Yves

    Yves Most Honored Senior Member

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    Dimmers in the house? Or other type of interference?
     
  8. Gautier30

    Gautier30 Strat-Talk Member

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    We have no dimmers here in France, or it is pretty rare. Plus, there are no neons nor any interference sources around...
     
  9. Yves

    Yves Most Honored Senior Member

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    Does it "whistle" even if no axe is plugged in ?
     
  10. Gautier30

    Gautier30 Strat-Talk Member

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    It stops when there's no jack plugged in actually
     
  11. Yves

    Yves Most Honored Senior Member

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    Have you tried moving away from the amp with a longer jack cable?
     
  12. Gautier30

    Gautier30 Strat-Talk Member

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    We'll try this
     
  13. Ronkirn

    Ronkirn Most Honored Senior Member

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    that introduces another factor... have you tried another guitar, and/or another cord...

    also turn off any other electronic equipment in close proximity... TV's, Computers, Security systems...

    rk
     
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  14. Jeepocaster

    Jeepocaster Senior Stratmaster

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    original filter caps still in there?
     
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  15. candyapple1964

    candyapple1964 Senior Stratmaster

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    There are probably some earth plates inside the chassis. Several of my old fenders have exibited the whistling sounds.

    Refreshing all the earth joints fixed it.

    Another thing that I speculate can cause a warbling or whistling noise is the old fibre board building up moisture. The whole thing may need to be dried out.

    Note too if the thing was serviced recently and its still got the old original power supply filter caps I would be looking for a new tech :)
     
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  16. Gautier30

    Gautier30 Strat-Talk Member

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    Thank you for your reply, we'll try to follow your advice
     
  17. Sarnodude

    Sarnodude Senior Stratmaster

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    When you eventually find the problem, please report back. It could be helpful to other strat talkers.
     
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  18. Gautier30

    Gautier30 Strat-Talk Member

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    Sure !
     
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  19. Uncle Jimmy

    Uncle Jimmy Senior Stratmaster

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    What an odd sound to be coming from an amp! Does it happen no matter which input the cable is plugged into? 99% of my electronics knowledge comes from building a tube radio back in high school shop, so FWIW, is there a short or wrong ground point somewhere between the jack field and a capacitor? The attack and decay of the sound seems to show a signal popping on and off, with the whistle in between. And the slight pitch shift seems to show a voltage change.

    Probably not helpful!
     
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  20. rolandson

    rolandson Still Breathing Strat-Talk Supporter

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    Starts up after the amp warms up a bit? Perhaps your tube sockets need to be retentioned.
     
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