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Laney TT50H No Outout

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  • Laney TT50H No Outout

    No output except low somewhat distorted thru return jack. Replaced all power/preamp tubes with known good tubes. Contact cleaner on cable in efx loop several times/overnight, jumped efx loop, no change. Any ideas greatly appreciated.

  • #2
    Originally posted by ca7922303 View Post
    No output except low somewhat distorted thru return jack. Replaced all power/preamp tubes with known good tubes. Contact cleaner on cable in efx loop several times/overnight, jumped efx loop, no change. Any ideas greatly appreciated.
    Schematic?
    - Own Opinions Only -

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    • #3
      https://elektrotanya.com/laney_tt50h_schematic.pdf/download.html
      It's All Over Now

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      • #4
        Have the schematic, thanks. Have a multimeter and have done some basic testing and soldering of resistors and caps. Am aware of how to drain voltage before working on amps.

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        • #5
          Originally posted by ca7922303 View Post
          Have the schematic, thanks.
          Please post it here for reference, so we all know what we're talking about.

          - Own Opinions Only -

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          • #6
            OK
            Download LANEY TT50H SCHEMATIC service manual & repair info for electronics experts

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            • #7
              Can't find a power amp schematic, only layout.
              - Own Opinions Only -

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              • #8
                I got this link from vintagekiki on this site, thought it was complete. Didn't look it over well enough I guess. Will see if I can find it elsewhere?

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                • #9
                  Drawing#9357_3 & 9357_4 are main power board drawings, but I cant find anything else online. I guess I'll have to try to email Laney?

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                  • #10
                    Post 3 contains the link to the service manual. Everything except a picture is included, even those connectors that is the main issue with most problems.
                    Support for Fender, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk

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                    • #11
                      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.

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                      • #12
                        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.

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                        • #13
                          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.

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                          • #14
                            Wondering if a bad efx mix pot could cause preamp to not function?

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                            • #15
                              Originally posted by ca7922303 View Post
                              Drawing#9357_3 & 9357_4 are main power board drawings, but I cant find anything else online. I guess I'll have to try to email Laney?
                              Yes, I would contact them and ask if there is a schematic showing the power amp.
                              "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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