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Myst G-ohm power supply problems

Discussion in 'd.i.y.' started by William Bates, Feb 13, 2020.

  1. William Bates

    William Bates New Member

    Hi, I am trying to rebuild my brother's Myst hifi & the psu was left in a leaky shed, I need to be able to identify the missing wirewound resistors & other components if anyone is able to help? Many thanks & God bless, Bill.
     
  2. Craig B

    Craig B Re:trophile

    Hello Bill,

    I don't have any answers for you, but perhaps your picture here might help others hazard a guess. The second picture is from a thread on here at pfm started by @misterc6, perhaps he can be of further assistance?

    [​IMG]

    [​IMG]
     
  3. misterc6

    misterc6 Wasted and wounded, it ain’t what the moon did

    Thanks for that Craig, I've been in conversation with Bill but had lost all my photos of the G-Ohm which I owned for a very short period and I never had any circuit diagrams.

    The layouts appear to be quite different. In the bottom photo, which I took, there's a bridge rectifier and two reservoir capacitors supplying positive and negative rails to the power amplifiers together with some small components around the right-hand socket presumably to supply a lower voltage to the preamplifier.

    By contrast, the upper photo shows a small circuit board and two active devices which I guess are supplying the preamplifier. Looking at the amount of rust damage perhaps a rebuild would be in order?

    Malcolm
     
  4. Craig B

    Craig B Re:trophile

    Thanks Malcolm.

    I've always had a soft spot for the tma3, despite never having seen one in the metal, let alone having heard one; it's just that it always appeared to be so exquisitely laid out within.
    Looking under the hood just soothes my OCD no end.

    Is this another shot of your patio table?

    [​IMG]
     
    337alant likes this.
  5. misterc6

    misterc6 Wasted and wounded, it ain’t what the moon did

    Yes, indeed it is!
     
  6. 337alant

    337alant Negatively Biased

    Very Nice :cool:

     

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