Marshall JVM410H loud pop and hum?

Discussion in 'Gear & Equipment' started by oceanrose, Apr 13, 2017.

  1. oceanrose

    oceanrose Pete

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    So i was jamming out to some 80s metal on my Marshall JVM the other night when suddenly, i hear a loud "POP" coming from the amp followed by an inherent hum (similar to the sound when you pull the guitar cable out whilst the amp was on). As soon as this happened, i quickly put the amp on standby and turned it off.

    Now this is where the problem starts for me. I turn on the amp to check if everything is in working order, and it is. The amp starts up fine with no pop, no hum. However, i kind of notice that the guitar sounds a little bit thinner (lacking some bass frequencies, and punch). At this point, i am wondering if something really bad did happened to the amp after that "pop", or if it is just my imagination since i have been tweaking the amp's setting the day before and am quite an OCD person.

    The "pop and hum" came in approximately after i turned the amp on for less than 10 mins. I am hoping that it is just my imagination and would like your opinion on the situation in regards to the following questions.

    1. Does anyone know what this pop and hum might be, and have anyone ever had a similar experience to this?

    2. Because i tried comparing the level and sound of the Marshall to another ENGL i have to see if there is a difference, i noticed that the level and dynamics/punch were quite similar, and with this being said, could it be something that is caused by bad/faulty wiring in the guitar itself?

    The amp is only 5 months old and was bought brand new..so i doubt the problem is with bad/old tubes although these things do happen. I look forward to hearing some advice and opinions from you!
     
  2. cwhitey2

    cwhitey2 BlackendCrust Metalâ„¢

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    Pre amp tube. Could be power tube but doubt it just for the fact you haven't blown a fuse.

    How old a tube has nothing to do with whether it will work or not on a new amp. You can get bad tubes.

    Just my :2c:
     
  3. oceanrose

    oceanrose Pete

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    I was thinking that too! This morning i turned the amp on the clean channel and even before i could start playing the "pop and hum" happened again, and i noticed a volume drop right away, however, after i switched to the overdrive channel and back to the clean, the volume that i had initially lost since the first the the pop happened seemed to have come back and everything is normal now!

    Any ideas what could be causing this? I reconnected all the cables just to make sure it wasn't a connection problem and am praying this doesn't happend again!
     

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