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Laney VC30 strange noise

Discussion in 'Glowing Bottle Tube Amp Forum' started by Craig Williams, Oct 22, 2020.

  1. Craig Williams

    Craig Williams Tele-Meister

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    Recently got a Laney VC30 tube amp and has a background noise, nearly like a wind sort of noise, or if you had a mic in front of a fan for want of a better explanation. It doesn't seem like guitar or ground noise. In fact it is doing it with the guitar unplugged and the amp volume on zero. I have tried turning back all the individual knobs to zero tone, reverb etc....no difference.

    The amp still sounds good and its not very loud, just in the background but enough to be annoying.

    Anyone have any ideas?
     
  2. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    Try changing preamp tubes. V1 and the phase inverter V3 can act this way.
     
  3. Craig Williams

    Craig Williams Tele-Meister

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    Which ones are the preamp tubes lol. Big or small ones?
     
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  4. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    The small ones. 12ax7 aka ECC83
    You can try moving the 3. Try the one that was in V2 in the V1 socket etc. They are interchangeable.
    They only go in the socket one way. Make sure the pins line up with the socket.

    You may have to gently rock them to get them out of the sockets.

    It is always good to have a couple spare tubes just in case.

    If you have another tube amp you can try those tubes as well.
     
  5. Craig Williams

    Craig Williams Tele-Meister

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    Thanks so much, will give it a try
     
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  6. Craig Williams

    Craig Williams Tele-Meister

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    I am surprised there is any sound coming out of the speaker with the volume on zero
     
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  7. Dacious

    Dacious Poster Extraordinaire

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    Indicates it may be the phase inverter tube - could also be one of the 4 power tubes.

    How old is the amp?
     
  8. Craig Williams

    Craig Williams Tele-Meister

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    I bought it second hand but its made in England so guessing maybe 8 to 10 years. Looks like its out of the showroom so I doubt its done a lot of work
     
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  9. richbike

    richbike Tele-Meister

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    i agree..swap the small tubes around.
    as i recall they are
    v1 preamps---v2 tone stack--v3 inverter

    so if you swap the v3 and v1, and its only noisy with the volume up the v3 is bad.

    i have a vc15 which did something similar (breathy sounds) but it was a bad v1 but only affected the drive channel
     
  10. Les Paul lover

    Les Paul lover Tele-Holic

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    If it makes noise with the volume on zero, it isn't the preamp valves.

    With the mast on zero, the signal doesn't get to the power valves.
    It could be the phase inverter, or most likely the EL84 if that sound is valve related (i would think so).

    If after changing the power valves, that noise isn't eliminated, it would be tech time. You might still want to swap the rest of the preamp valves, but I d9nt beleive that's where the issue is.
     
  11. Dacious

    Dacious Poster Extraordinaire

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    I'd hazard a guess and say it's original power tubes on the way out
     
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  12. MuddyWolf

    MuddyWolf Tele-Meister

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    Isn't the answer 999999.99% tube failure? We could eliminate the whole "what's wrong" topic if first time tube amp owners were told this at the unboxing.
     
  13. JWH7

    JWH7 Tele-Meister

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    It could be a ground loop problem. get a cheap little 3 prong - 2 prong adapter and plug the amp cord to the wall outlet with this adapter and see if you noise go's away. adapter is less than a buck and a cheap way to trouble shoot. if it is a ground loop problem they sell a Hum-x plug in adapter that is a good investment
     
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