EVH 5150 - no power to tubes - techs?

Discussion in 'Amps and Cabs' started by Motterpaul, Feb 12, 2015.

  1. Motterpaul

    Motterpaul Tone is in the Ears

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    Any 5150 (100-watt) techs here?

    My 100-watt suddenly is not getting any power to the output tubes, or to most of the pre-tubes. The tubes are good (I just tried them in another amp).

    The problems started with channel switching - and just got worse.

    All fuses appear to be good (tested with Voltmeter)

    Where do you take these amps for repair in Phoenix?
     
  2. jorlevis

    jorlevis Member

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    Depending on if you purchased it new, it should be covered under fenders warranty. I'd try giving them a call first.
     
  3. Motterpaul

    Motterpaul Tone is in the Ears

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    Thanks - but I did not buy it new.
     
  4. jorlevis

    jorlevis Member

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    Aw, well fender does have a base in Scottsdale, Arizona, still might not be a bad idea to call them.
     
  5. Motterpaul

    Motterpaul Tone is in the Ears

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    Thanks - yes, I emailed them as well as HK who works there, and I was recommended a tech to take the amo to, so I think I am set.

    I am very interested to see what the problem may be.
     
  6. sgmarshall

    sgmarshall Member

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    There is a fuse on the main circuit board, but I can't remember if it's replaceable or not- it may be soldered if I remember correctly, I think it was to protect the output transformer in case of no load.
     
  7. LPVM

    LPVM Member

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    I had the same problem with my 6505+ when I got it. It ended up being this:

    [​IMG]

    [​IMG]

    Tha cable connects the preamp board to the power amp board. Position J11 burnt which caused the housing to distort so the contact didn't mate with the pin. That happens to be the filament circuit so all tube were dark. The pin got hot and melted the solder a little but did burn the trace so I reflowed the solder at that pin it and hardwired the boards together with hookup wire. It's all good now.
     

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