Question about VOX Amplification Vox Valvetronix VT50 Modeling Combo Amp

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I have a Vox VT50 Modeling amp. Bought it about 4 years ago. Played maybe 3 hours if that at very low volumes. After 2 years when I turned it on it would work fine until I changed volume then it would lose almost all volume and punch. If I turned it up it would go up but without out punch or the normal volume. If I changed modeling sounds it would be fine again till I changed volume then do the exact same thing. Master volume works fine just the regular volume knob does this. What can I do??

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Posted on Jan 02, 2017

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SOURCE: When I use the Master

I suspect you may have either a circuit board crack or the volume pot is bad or soldering of it is bad. Vibration will make things come and go. Look for broken solder around the pot leads first. Then look for a cracked circuit trace on the board near the ground end of the volume pot. If you put cleaner in the pots NEVER use Deoxit or Blue Shower. Use CRC226 which is available at Home Depot in the electrical dept.

Posted on Apr 29, 2011

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SOURCE: I have a VOX NT15.

You LIKELY have a bad filter capacitor. The additional load of the Triode load is probably dragging the supply causing flattopping and the power supply ripple frequency to come through. Have the unit serviced.

Posted on Jul 26, 2011

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