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Troubleshoot an amplifier

Discussion in 'Troubleshooting and Repair' started by trihai, Oct 15, 2017.

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  1. trihai

    trihai

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    0
    Oct 15, 2017
    I am trying to troubleshoot a hybrid tube amp; a Melos Triode 200 plus series. The amp is still working but the sounds is not great. At first, I thought the issue was the tubes, so I bought brand new tubes, and when I tried to install them, I noticed that several resistors with broken legs.
     

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  2. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    Yes, we know. You already started a thread about it.......
     
  3. FuZZ1L0G1C

    FuZZ1L0G1C

    368
    118
    Mar 25, 2014
    Is amp/board old second hand?
    Many parts missing, broken off and whole PCB needs a good clean.
    Zooming in, looks like valve bases oxidized (whitish film).
    2 HV caps' tops look like "possibly" blown (picture).
    (A) check caps
    (B) servisol all metal contacts/pins
    (C) wash dust off
    grubby1.jpg grubby2.jpg
     
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