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VOX AD100VT Troubleshoot

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  • VOX AD100VT Troubleshoot

    Hey ya'll. So I'm an A1C in the USAF stationed on Okinawa Japan. I was taking my trash out the other night when the glint of three chrome letters caught my eye from inside the dumpster. After a little digging the culprit revealed itself to be a VOX AD100VT modeling amp. Needless to say I left my trash and took the amp with back to the room with me.

    I plugged it in and jacked my guitar in, but alas, no sound. The head powers up, and as far as I can see the subs aren't blown, so I'm guessing there's an electrical problem with in the head unit itself. I took the backing board off and removed the head unit, pulled the 12AX7 out of its socket, and gently removed the main board. It does appear that there was a liquid spill involved with the apparent demise of this amp, as there a suspiciously puddle shaped discoloration inside the head and what looks like dry droplets of whatever was spilled into it (knowing this place like I do: Beer) in a couple places around the board itself. I'm stuck at this point however, due to my extremely limited knowledge of electronics. I don't know what signs to look for to diagnose damaged components, how to fix them if I did or if this is amp is even salvageable.

    So I'm hoping someone here has the knowledge to help me out. I can post pictures if need be and am proficient enough mechanically and electrically to follow the instructions of someone who knows what they're talking about. Thanks a lot ya'll, hope to hear back from someone soon.

  • #2
    *bump
    Don't know why but after I posted this I couldn't get back into the forums. Kept telling me the server wasn't responding. Working now though. So anyone have any ideas?

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    • #3
      Vox AD100VT

      Just sat one of these on my bench.
      With power on, using a voltage meter, test the Volts dc of the two bigger capacitors on the main board. You should see 70 some volts.
      If you have another working amplifier, run the Effects Loop Send to that amps input, with an input in the Vox control board.
      This will tell if it is a preamp or power amp issue.
      Did the spill involve the board with all the controls on it?

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