Brief Hum Coming Off Standby

Discussion in 'Amp Tech Center' started by JayDee, May 22, 2020.

  1. JayDee

    JayDee Tele-Meister

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    Hello all. I recently noticed my Deluxe Reverb Reissue humming for about 20 seconds or so after I switch it off of standby. I've had this amp since around 2004 and never noticed it. It's a new sound. It seems fine after the hum goes away. Have you had this issue or know what causes it? Thanks.
     
  2. Paul G.

    Paul G. Friend of Leo's

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    Check your filter caps is my guess.
     
  3. Jon Snell

    Jon Snell Tele-Meister

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    Whilst the output valves are balancing a 120HZ hum can be heard to fade out. Depending on the chassis, either reset the bias balance or replace the output valves for a matched pair and set the bias current to 42mA or your preferred heat.
     
  4. JayDee

    JayDee Tele-Meister

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    Thanks for the tips. I appreciate the help.
     
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