Tube amp problem: loud pops and thumps noise!

Discussion in 'Audio Hardware' started by DoF, Sep 11, 2019.

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  1. jea48

    jea48 Forum Resident

    Location:
    Midwest, USA
    Wonder what this circuit looks like.

    High DC voltage delay circuit to protect tubes
     
    Rick Bartlett likes this.
  2. DoF

    DoF Less is more... Thread Starter

    Location:
    Poland
    So it's not a full fledged tube amp?
     
  3. jea48

    jea48 Forum Resident

    Location:
    Midwest, USA
    Yes it is a "full fledged tube amp".

    Features:

    It's yaqin latest version of EL34 push pull integrated tube amplifier




     
  4. timind

    timind phorum rezident

    Probably a bad DC coupling cap in the preamp section, especially the first sound. Or, since the amp is fairly new, a bad solder joint in the same section.
    As it doesn't read like you are a technician, you should take the amp in for service.
     
  5. Mike from NYC

    Mike from NYC Senior Member

    Location:
    Surprise, AZ
    I suspect power supply issues
     
    SeeDeeFirth and vconsumer like this.
  6. Strat-Mangler

    Strat-Mangler Personal Survival Daily Record-Breaker

    Location:
    Toronto
    You got the amp in December. One of the tubes stopped working within 8 months of use and now this. Doesn't say much for Yaqin's QC.
     
  7. DoF

    DoF Less is more... Thread Starter

    Location:
    Poland
    Problem solved, three of preamp tubes turned out to be defective, (the Russian NOS tubes I've purchased lately). All's good now. Thans for your support here on the thread!
     
    KT88 likes this.
  8. timind

    timind phorum rezident

    I recently bought, and installed a quad of Russian (7189A) NOS tubes. One of the tubes red plated within the first 10 hours of use. :realmad: Kind of scary.
     
    DoF likes this.
  9. Benzion

    Benzion "Cogito, ergo sum" Forum Resident

    Location:
    Brooklyn, NY
    The only instance this happened to me is with voltage sag, and two 12AX7 tubes went dark simultaneously. The only real way to know, which is also beneficial for your whole system, is to buy a power conditioner with a voltmeter and have all the components plugged into it. What also helps is having the power conditioner plugged into a voltage regulator that compensates for voltage sag when it occurs.

    And don't be scared off - these things are not really expensive. I paid something like $120 for my Furman power conditioner, and about $60 for APC voltage regulator.
     
    waaguirr, Spin Doctor and DoF like this.
  10. Benzion

    Benzion "Cogito, ergo sum" Forum Resident

    Location:
    Brooklyn, NY
    [​IMG]
     
  11. DoF

    DoF Less is more... Thread Starter

    Location:
    Poland
    Bummer.
     
    timind likes this.
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