Ampeg V4B with GK RBH Cab

Discussion in 'Amps [BG]' started by Diegol, Jan 14, 2013.


  1. Diegol

    Diegol

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    Hello

    Hope someone could help. Is there any other way of connecting my amp through this cabinet rather than the normal 1/4 input?

    Maybe something that gives me more control, headroom.. i don't know. Just experimenting and I don't want to blow anything

    THX
     
  2. JimmyM

    JimmyM Supporting Member

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    Why do you need another way?
     
  3. B-string

    B-string Gold Supporting Member

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    The amp provides the "headroom".
     
  4. BassmanPaul

    BassmanPaul Gold Supporting Member

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    No. It's a 100W amp and that's all she wrote.
     
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  6. GreaserMatt

    GreaserMatt

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    What a great amp tp own though! Pics please... LOL
     
  7. Diegol

    Diegol

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    Thx

    Its a late V4B... I changed the plate just for looks so now it has those early V4B plates they sell at flip top. The grill was all torn so i removed it and hopefully would get one soon.

    I really love the amp but lately i hear it distorting too early. Don't really know what to do for more headroom. Maybe its the speakers at some point
     
  8. B-string

    B-string Gold Supporting Member

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    How early does it break up? 11:30 to 12:00 is about the max clean with a little bite.
    You could have a weak preamp tube or output tubes getting weak or drifted too far from the idle bias point.
     
  9. Diegol

    Diegol

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    Hey..

    its breaking at 10... too early I think... Im no amp expert and sadly, here in Chile, the options on finding someone who know about this is limited...
     
  10. B-string

    B-string Gold Supporting Member

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    !0:00 is too early. Is this the newer master volume model? Both channels break up at same point?
     
  11. Diegol

    Diegol

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    no master volume... yes, same for both channees
     
  12. B-string

    B-string Gold Supporting Member

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    So lets try an experiment. No bass plugged into the amp, turn the volume up all the way (speaker cab connected!). If you hear a hum adjust the "Hum Balance" control on the rear of the amp for the least hum. If the hum can not be made barely heard the power supply caps may be weak and that will cause the early distortion. If the hum started out bad and now is quiet try the amp again before looking for weak tubes.
     
  13. JimmyM

    JimmyM Supporting Member

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    10:00 isn't necessarily too early if you have a hot bass. However, most of them start breaking up around the 11:00-12:00 point.
     
  14. B-string

    B-string Gold Supporting Member

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    Yes this could be true. With my V4B I used a 12AU7 for channel one to make it friendly for my active 4 string. Channel two was standard for the passive 5 string.
     
  15. anderbass

    anderbass

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    The lower-register/E-string notes start breaking up around 10 o'clock on my V4 too.
     
  16. B-string

    B-string Gold Supporting Member

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    Sounds like adding a bias adjustment pot would be in order for newer production tubes. Easier than than having to replace resistors every time there is a bias drift. Granted if the power supply and bias caps are up to spec.
     
  17. Diegol

    Diegol

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    Hey BString

    Tried your experiment. It turns out, the amp already had a bit of hum (don't really know how to explain if its normal or not) but turning the balance just made it worst.. so..
     
  18. B-string

    B-string Gold Supporting Member

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    If you can not get the hum out with the balance control (turn it both ways to where the hum is the least or gone) you may have a bad tube or weak filter caps.
     

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