Question about VOX Amplification Vox VT40+ Valvetronix Guitar Combo Amplifier (40 Watts, 1x10 in.)

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Vox vt40+ My vox vt40+ has an issue with no sound coming from the speaker however if I plug into the headphone jack I get perfect sound

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That is because it is two different output channels. eventually you will blow the speaker or your amp. It wasn't designed to handle the impedance of an external speaker through the stereo
headphone jack. Are you sure that your speaker is hooked up or plugged in?

Posted on Apr 20, 2014

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Try using your guitar cord to plug in and out of the headphone jack several times while unit is on. There is a circuit that disconnects the speaker when using headphones and the circuit is activated when something is plugged into the headphone jack. This "switch" can get dirty and cause the can get dirty and cause the problem you describe.

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Assuming you plugged into the headphone jack, the switch contacts on the jack have apparently failed.

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