bassmanady Posted April 8, 2012 Share Posted April 8, 2012 I am guessing its a fault in the preamp,but hoping it may just be the tone pot that needs replacing. Starting with the tone knob in the centre detent and boosting there is no change in volume to the bass frequency, Starting with the tone knob in the centre detent and cutting has little effect on the volume/bass frequency until nearly turned all the way then it cuts quite a bit. So for around 80% of its travel there is no change in volume or tone, All the other controls still work fine. Anyone had this problem or know what the problem could be Thanks in advance Ady Quote Link to comment Share on other sites More sharing options...
icastle Posted April 8, 2012 Share Posted April 8, 2012 If the pot rotates without crackling or grating then it's unlikely to be that - they either work or they mechanically fail. I presume you've already tried replacing the battery? If so, you're potentially looking at a preamp fault or a failed connection. What sort of bass is it? Quote Link to comment Share on other sites More sharing options...
Dad3353 Posted April 8, 2012 Share Posted April 8, 2012 Did it work at all on any previous occasion..? If so, what has changed (dropped 6', left out in rain, left 6 months with jack plugged in, ravaged by forest fire, etc..?) Quote Link to comment Share on other sites More sharing options...
bassmanady Posted April 8, 2012 Author Share Posted April 8, 2012 [quote name='icastle' timestamp='1333908387' post='1608109'] If the pot rotates without crackling or grating then it's unlikely to be that - they either work or they mechanically fail. I presume you've already tried replacing the battery? If so, you're potentially looking at a preamp fault or a failed connection. What sort of bass is it? [/quote]just wishful thinking it may have been the pot,its my Yamaha bb2005,and i have tried a new battery,so need to get it looked at. thanks Quote Link to comment Share on other sites More sharing options...
icastle Posted April 8, 2012 Share Posted April 8, 2012 [quote name='bassmanady' timestamp='1333918735' post='1608328'] just wishful thinking it may have been the pot,its my Yamaha bb2005,and i have tried a new battery,so need to get it looked at. [/quote] The lowest grade component in all pre-amps that use 9V battery clips - is the battery clip. Before you pay to have it looked at, take a careful look at it and make sure that the wires going into the little snap on connector haven't fallen off - give the red and black wires a gentle tug and make sure they stay put. Follow those cables back to the points they are connected to (one to the jack socket and one to the preamp PCB usually) and make sure they're connected properly. If the fault isn't there then it's going to need more in depth diagnosis, but you might strike lucky... Quote Link to comment Share on other sites More sharing options...
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