Paul S Posted August 15, 2011 Share Posted August 15, 2011 In another topic, probably in the wrong forum, I was asking about my Fender Precision Lyte pre-amp. I've since been thinking and now wonder if the problem might not be the pre-amp at all - can someone please help? One of the knobs doesn't work. I think it is the bass boost/cut but it is hard to actually say which when only one of them is working. But a thought struck me this morning - that the fact one of the knobs works just fine and the bass plays and sounds ok - does this indicate that there is nothing wrong with the pre-amp but just with the pot? Quote Link to comment Share on other sites More sharing options...
Paul S Posted August 16, 2011 Author Share Posted August 16, 2011 Prett please help? You could save unnecessary torture of a poor Fender? Quote Link to comment Share on other sites More sharing options...
KiOgon Posted August 16, 2011 Share Posted August 16, 2011 Sound like it needs looking at by someone in the know, or at least with a meter for starters. If you were closer I'd have a look Not much chance of fixing it without seeing what's going on I'm afraid. Cheerz, John Quote Link to comment Share on other sites More sharing options...
Paul S Posted August 16, 2011 Author Share Posted August 16, 2011 OK, thanks. Explains the radio silence, anyway - I thought it was something I said. Well, I suppose it was, really Quote Link to comment Share on other sites More sharing options...
Acebassmusic Posted August 16, 2011 Share Posted August 16, 2011 (edited) Have you opened up the back of the bass and looked for loose wires or bad solder connections? Have the electrics always been like this or has it just started to not work? Edited August 16, 2011 by Acebassmusic Quote Link to comment Share on other sites More sharing options...
Paul S Posted August 16, 2011 Author Share Posted August 16, 2011 Hi ABM and thank you for your reply. Yes - all wires are attached, some messily it has to be said - I have only recently got it and it came with the fault. The full story - when I first got it I sent it off to my usual tech guy for a set up and to see if he could work out what the problem was. He said he thought the pot was broken but wasn't sure, adding that it might be a quicker and cheaper fix to stick a new preamp in there, having already done this for me with my SGC Nanyo Bass Collection and a new Artec preamp. I am thinking he didn't fancy doing the job or it was beyond his knowledge. My original question was [url="http://basschat.co.uk/index.php?showtopic=150461"]here[/url], which kind of explains how I got to this post. Of course the easiest thing to do would be to take it to someone who knows exactly what to look for but I am getting to the stage with this where I am reluctant to throw much more money at it. If all it takes is putting a new pot in place I feel confident enough to do this myself now that I have practiced my soldering skills a bit recently. I have the back off at the moment and am about to take all the guts out of it to see more clearly what is going on but, with a basic lack of understanding about how all the bits fit together etc, I am fumbling about in the dark a bit. Any pointers would be immensely helpful. Quote Link to comment Share on other sites More sharing options...
gary mac Posted August 16, 2011 Share Posted August 16, 2011 Seems a bit strange that he told you a new pre amp wouold be a cheaper fix than a new pot. If you are confident with the soldering have a go. A new pot is a low cost item really. It will give you a chance to have a good tidy up and sort out the dodgy soldering already present. Quote Link to comment Share on other sites More sharing options...
Paul S Posted August 16, 2011 Author Share Posted August 16, 2011 I think I will. Would you, or anyone, have any particular recommendation as to type/where to buy etc? It is going through a wood body rather than a scratch plate, so needs a longer shaft. Quote Link to comment Share on other sites More sharing options...
KiOgon Posted August 16, 2011 Share Posted August 16, 2011 [quote name='Paul S' post='1342292' date='Aug 16 2011, 07:17 PM']I think I will. Would you, or anyone, have any particular recommendation as to type/where to buy etc? It is going through a wood body rather than a scratch plate, so needs a longer shaft.[/quote] [url="http://www.wdmusic.co.uk/product/Premium_500k_Long_Shaft_Pot_10%25_Tolerance_CTS500XL"]WD Music[/url] are pretty good, example shown is 500K, have a look at your old one & see what ID is on it. Quote Link to comment Share on other sites More sharing options...
Paul S Posted August 17, 2011 Author Share Posted August 17, 2011 OK, some pics. Here is the troublesome pot. It has M20KΩG and then 16C written on it. [attachment=87271:pot1.jpg] Here are the others: I think this is the volume? It has the same thing written on the side of the pot. [attachment=87272:pot2.jpg] The other cut/boost - it is marked M20KΩA 10C [attachment=87273:pot3.jpg] The blend - I don't know much about guitar electronics but this looks a right old mess to me [attachment=87274:pot4a.jpg] [attachment=87275:pot4b.jpg] And for good measure the jack as well. [attachment=87276:jack.jpg] Ok. 20K pots - is this unusual? And would any make of pot fit into the pcb? Any advice or pointers appreciated. Ta. Quote Link to comment Share on other sites More sharing options...
KiOgon Posted August 17, 2011 Share Posted August 17, 2011 From here - I would say it's unlikely the pot is faulty, much more probably a bad/dry joint somewhere on those pcbs. It needs looking at I wouldn't worry about getting another pot until someone's put a meter across it. Quote Link to comment Share on other sites More sharing options...
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