Need Help My 1971 Marshall Superlead won't power up

Discussion in 'Amps and Cabs' started by 67PLEXIFREAK, Mar 29, 2015.

  1. 67PLEXIFREAK

    67PLEXIFREAK Member

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    One day I went to turn on my 1971 Marshall Superlead attached to my 4x12 cab (Stupid me was plugged straight in the wall) and NO RED LIGHT_NO POWER_NOTHING!

    I did everything I can do without sending it to my repair tech. I replaced the fuse's and pre-amp tubes and nothing.

    Is it a capacitor? Could it be a minor repair or is it over my head and needs to go to a professional repair tech?

    PLEASE ADVISE- THANKS!
     
  2. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Probably power tubes.
     
  3. Trotter

    Trotter Supporting Member

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  4. Vox66

    Vox66 Member

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    Pay your electric bill! :)
     
  5. Structo

    Structo Member

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    Do the tubes light up?
     
  6. Braciola

    Braciola Silver Supporting Member

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    You say you replace all the fuses, and the power led isn't coming on?
    Sound like a bad power transformer.
     
  7. rockbutt

    rockbutt Member

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    Its most likely the power transformer.
     
  8. hogy

    hogy Member

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    You replaced the fuse's what?
     
  9. rockbutt

    rockbutt Member

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    I think he probably meant to say "fuses" as a plural noun.
     
  10. gldtp99

    gldtp99 Member

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    If the Mains fuse is good and the amp doesn't power up---- the problem could be the Power Switch, Power Cable, Power Transformer, or a situation where no power is being supplied to the amp through the wall socket.
    Logical, step-by-step troubleshooting is a wonderful thing----- this is what a good tech does for a living.
    Snap guesses via the internet with no testing/measuring to back them up are pretty much worthless........................... gldtp99
     
  11. Dr. Tweedbucket

    Dr. Tweedbucket Deluxe model available !!!11

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    Well, first check your wall socket, then it sounds like you checked all your fuses. It could easily be a power switch ... do you have a meter? You should see 120VAC on one side and then switched on the other (if it was working). Power tranny could have toasted. If you have AC on the input and nothing on the output, that's not a good thing. DON'T touch anything on the inside of the amp ... use a ground jumper clip and keep one hand in your pocket..... just to avoid getting shocked.


    If the tubes light up, that's a good thing. I'm hoping you didn't smoke your output tranny. Sometimes those pinned voltage and impedance plug ins on the back get worn and don't make contact .... check those too.

    Good luck.
     

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