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Laney TT50H No Output

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  • Laney TT50H No Output

    Has low somewhat distorted output thru send jack only. Replaced all power/preamp tubes w/known good tubes. Contact cleaner on cables in efx loop in and out/overnight, jumped efx loop: No change. Have schematic, multimeter, some exp. desoldering, soldering caps/resistors, etc. No how to drain voltage off before working on an amp. Any ideas would be greatly appreciated.

  • #2
    Re: Laney TT50H No Output

    Effects loop was my Laney's kryptonite

    But you've done that

    Can you plug into the effects return and get any sound

    This divides the amps preamp and power amp
    If no sound from fx return then its probably the output section is bad
    EHD
    Just here surfing Guitar Pron
    RG2EX1 w/ SD hot-rodded pickups / RG4EXFM1 w/ Carvin S22j/b + FVN middle
    SR500 / Martin 000CE-1/Epiphone Hummingbird
    Epiphone Florentine with OEM Probuckers
    Ehdwuld branded Blue semi hollow custom with JB/Jazz
    Reptile Green Gibson Custom Studio / Aqua Dean Shire semi hollow with piezo
    Carvin Belair / Laney GC80A Acoustic Amp (a gift from Guitar Player Mag)
    GNX3000 (yea I'm a modeler)

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    • #3
      Re: Laney TT50H No Output

      Just ran line out and record out to another amps input and got a good clean signal. None of the preamp controls on channels 1,2,3 work, but volume 1 and volume 2 work, amp mute works, and fx mix is scratchy and tries to cut volume off at "0" but intermittent scratchy signal still comes thru at "0". Also, there is a high pitched whistle if volume is turned up past "8" on either amp. 2nd amp does not do this when TT50H is not plugged into it. Previously jumped efx loop with no change in output.

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      • #4
        Re: Laney TT50H No Output

        Originally posted by ca7922303 View Post
        Just ran line out and record out to another amps input and got a good clean signal. None of the preamp controls on channels 1,2,3 work, but volume 1 and volume 2 work, amp mute works, and fx mix is scratchy and tries to cut volume off at "0" but intermittent scratchy signal still comes thru at "0". Also, there is a high pitched whistle if volume is turned up past "8" on either amp. 2nd amp does not do this when TT50H is not plugged into it. Previously jumped efx loop with no change in output.
        Wondering if a bad efx mix pot could cause the preamp on this head to not function?

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        • #5
          Re: Laney TT50H No Output

          Shoot yeah
          EHD
          Just here surfing Guitar Pron
          RG2EX1 w/ SD hot-rodded pickups / RG4EXFM1 w/ Carvin S22j/b + FVN middle
          SR500 / Martin 000CE-1/Epiphone Hummingbird
          Epiphone Florentine with OEM Probuckers
          Ehdwuld branded Blue semi hollow custom with JB/Jazz
          Reptile Green Gibson Custom Studio / Aqua Dean Shire semi hollow with piezo
          Carvin Belair / Laney GC80A Acoustic Amp (a gift from Guitar Player Mag)
          GNX3000 (yea I'm a modeler)

          Comment

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