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Post subject: TBP-1 preamp: plug in foot switch causes amp to be mute
Posted: Fri Jun 21, 2019 3:05 am
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Joined: Wed Jun 19, 2019 11:59 pm
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Hi Forum. This bass preamp comes with a 4 switch foot switch. As soon as I plug in a cable in to the foot switch socket the amp goes immediately mute and the indicator lamp is flashing at the front panel. As it would when pressing the mute button on the front for muting. Other then that the amp functions perfectly except if I plug in the foot switch cable. I did release (off position) all knobs at the front panel as it is mentioned in the manual for proper functionality of the foot switch.
By checking the control lamps at the front panel I can see that the first 3 foot switch knobs do work except the mute switch is not triggering. The problem I thing is on the amp itself since it already mutes by plunging in the jack at the back (with ore without the foot switch attached). What could be the cause?

By looking in the electrics I can see a connection which I'm not sure it should bee like this. Maybe a professional electrical person could tell my if this is suppose to be like this.
Thanks a lot!

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Post subject: Re: TBP-1 preamp: plug in foot switch causes amp to be mute
Posted: Sun Jun 23, 2019 5:30 am
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Joined: Fri Apr 08, 2011 5:14 pm
Posts: 3169
Location: Linningrad
Hi LeeLuu. Those pre-amps are pure tone magic. With any luck a forum member named Tims Audio will see your post and comment. He's a pro amp tech. You can always send him a message and ask him to check out your thread.

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