Crate PowerBlock 150 very low volume

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  • Camarada78
    Member
    • Jan 2021
    • 28
    • Brazil
    #1

    Crate PowerBlock 150 very low volume

    Hello,

    I have a Crate Powerblock cpb150 on bench right now.

    It has very low volume, although everything appears to be working fine.

    The powersupply (a common issue on this unit) is giving me all the juice needed but i still have low volume.

    It uses a lot of 072 as preamps and a tda8920th as the class d poweramp.

    The class D is receiving the +/- 25 volts as it should.

    The volume is low either on 8 ohms, or 4 ohms stereo and on the heaphone amp as well.

    I think its a preamp issue, but i dont know. i'm not used to tda8920th, dont know how they should behave.

    If anyone could give a light... i would be thankful.





    Thanks in advance for the help.
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    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30991
      • Albion
      #2
      Re: Crate PowerBlock 150 very low volume

      TL07/08 type op-amps are always a good place to start.

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