My Evil Robot amp is a Dead Robot amp help!

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by Goldstrat, Mar 29, 2015.

  1. Goldstrat

    Goldstrat Supporting Member

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    Wondering if anyone has experience working on the Evil Robot Chinese version? All tubes light up and test good but I have no sound at all. The board looks fine with no obvious problems. I tried the speaker out and no sound either. Tubes, LED's and fan all work. I should have known better.
     
  2. xtian

    xtian Member

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    Any other fuses on the board? Common for HT to be fused separately, so you might see all heaters and panel lamps alight, but no sound. Testing with a voltmeter is next. What's your experience level?
     
  3. Goldstrat

    Goldstrat Supporting Member

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    I can't find any other fuses on the board. I am not a tech but I have built a 5e3 and I do my own bias etc. I do know how to safely work in a tube amp. All the LEDS are lit and tubes. I tested each tube in a SE amp and they all work. I plugged in an external speaker and no sound then plugged in the effects loop to see if it made a noise and nothing.
     
  4. RiftAmps

    RiftAmps Member

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  5. slider313

    slider313 Silver Supporting Member

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    Wouldn't this be under warranty?
     
  6. Goldstrat

    Goldstrat Supporting Member

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    I got it in a trade with a Les Paul and it worked for about 1 hour before it died. I did contact Kasha amps and he told me to try a few things then said if I want to send it to him it is $150 an hour. As far as I am concerned the amp isn't worth $150. I will never buy another imported circuit board amp. All of my other amps are handwired type amps and I can usually fix them myself.
     
  7. Goldstrat

    Goldstrat Supporting Member

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    It looks like there is no voltage on pin 3 of the power tubes so I guess that answers my question. Thanks for all the help!
     
  8. Goldstrat

    Goldstrat Supporting Member

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    Thank you for all the advice. This turned out to be 2 fried resistors on the bottom side of the board. Had to take the whole thing apart flip it over then it was obvious.
     

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