Crackling Noise in Power Up and Down

Discussion in 'Amp Tech Center' started by Kcz5o, Sep 24, 2019.

  1. Kcz5o

    Kcz5o TDPRI Member

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    I thought this might be a good place for a quick amp question. Thanks in advance for any replies. I recently purchased a SANO 500 amplifier. When I bought the amp it didn't power up and had a blown fuse (which was way too big). I replaced the filtering capacitors in the power section and any electrolytics. It powers up now and is fairly quiet except for some noise in the reverb circuit. The problem I am having is that when I turn the amp on there is a loud crackling sound until it powers up. It does the same thing when I turn it off. I replaced a cap can on my Princeton reverb and that does the same thing. Is it possible that it is a poor ground on the cap can? The cap cans are hard to solder. Any ideas? Again thank in advance.
     
  2. corliss1

    corliss1 Friend of Leo's

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  3. jtcnj

    jtcnj Tele-Holic

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    I bought something like that too - didnt realize it is 220v input!!
    I'm short less than a six-pack of beer money for the mistake - live and learn.


    But yeah, you need a hot iron for the chassis / back of pots in guitars, etc.
    Gotta put a lot of heat in quickly and get out.
     
  4. Kcz5o

    Kcz5o TDPRI Member

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    The noise only lasts for a second or two. I wondered if someone knew exactly what caused that type of symptom. I used a 250 Weller gun and it melted the solder to the chassis but I always wonder if it is a good ground. I suppose if it is working and there is continuity the ground must be ok. When I've changed filter capacitors I've always powered them up with full power rather than using a Variac as I don't have one. I wonder if that would make a difference? Thanks for the replies.
     
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