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I have a crate fxt 120. I 'll be playing in the #2 overdrive channel and it will automatically fail and go to a clean sound. Although it is not entirely clean. It sounds like 2 sounds combined. A loud clean and a low volume distortion. I'll tweak the "shape" knob, it will correct itself and revert back to the overdriven tone. This fix is only temporary because it will eventually happen again, 5-10 minutes later while I'm playing. How can I fix it from switching on me?

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  • Crate Master
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A possible problem MIGHT be marginal switch contacts on the external foot controller cable. If you are not using the foot pedal, these contacts must maintain contact to keep the same channel selected.

Posted on Sep 16, 2010

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  • kianicockett Sep 17, 2010

    Thanks for the reply but I'm hard of understanding. This problem happens with or without the footswitch plugged in. How can I "maintain contact to keep the same channel selected?" It seems to be acting up in the left area of the control panel. When I tweak the input cable, shape knob, or either gain knob, the problem will correct itself temporarily. what to do?

  • Fred Yearian Sep 17, 2010

    The contacts on some of the jacks on these amps are really weak. These contacts default the signals to the channel selection switches when foot controller is not in and send the signals through the foot controller if plugged in. The signals are digital and if they don't have good contact to either the footswitch or the bypass the channel may change. The nature of these are slight vibration of the cabinet or circuit board when plugging in a cable can temporarily fix the problem.
    The problem ALSO may be bad soldering around these connectors which is fairly common. If a cable has been jerked by tripping over it, these jacks sustain damage easily.
    I would open up the unit and do a visual inspection around all the jacks and also pins from volume controls where they solder to the board.
    If you want to attempt a DIY repair, remove the amp from the cabinet. With a small soldering iron, retouch all the soldering of the 1/4 inch jacks and the controls. Also check if the contacts have sufficient contact pressure.

  • kianicockett Sep 20, 2010

    Thanks for the explanation. It seems that something is loose. I'm going to operate on it tonight

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Hi, you hadnt mentioned how long you've had the amp, or how new it is, so I'm going to assume it's new to you. The Crate VTX200 has 3 channels, each with its own volume level. Let's check the simple things first:
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