squire5 Posted March 19, 2022 Share Posted March 19, 2022 I have wired up a jazz bass control plate with a 250K blend pot.My problem is that it only works in 1 direction.By that I mean,if I pan from bridge pup to neck pup,the signal disappears from the centre detent onwards,ie the neck pup is not sounding.If I reverse the wiring,the opposite happens.Is that the right blend pot I've got,as I've stripped and rewired the whole thing twice,but its still doing it? Any pointers guys? I'm following this diagram. Quote Link to comment Share on other sites More sharing options...
KiOgon Posted March 19, 2022 Share Posted March 19, 2022 What pot is it exactly? Quote Link to comment Share on other sites More sharing options...
KiOgon Posted March 19, 2022 Share Posted March 19, 2022 (edited) That drawing looks wrong, who wires the jack at the top of the bell plate and the blend t'other end? Wierd 😏 Try this; Edited March 19, 2022 by KiOgon 2 Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 19, 2022 Author Share Posted March 19, 2022 57 minutes ago, KiOgon said: What pot is it exactly? Here it is,copied from Ebay listing.Bourns Blend Pot Mini with Centre Detent 6mm Solid Shaft 250k Linear Taper Quote Link to comment Share on other sites More sharing options...
KiOgon Posted March 19, 2022 Share Posted March 19, 2022 (edited) Should be good, although I always use Log. The S/D diagram is what I usually follow. Edited March 19, 2022 by KiOgon I put the wrong link up - my bad Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 19, 2022 Author Share Posted March 19, 2022 Thats the same pic I posted Ki0gon and from the same website.I stripped it down and started again from scratch.Now,both pups are on until the centre detent,and then both abruptly switch off.I'm going to leave it till tomorrow until my heads cleared a bit.Thanx for your input. Quote Link to comment Share on other sites More sharing options...
PaulThePlug Posted March 19, 2022 Share Posted March 19, 2022 (edited) What Pot ya got... No ebay link... AC or MN? They are different and wired different.. Edited March 19, 2022 by PaulThePlug Quote Link to comment Share on other sites More sharing options...
KiOgon Posted March 19, 2022 Share Posted March 19, 2022 34 minutes ago, squire5 said: Thats the same pic I posted Ki0gon and from the same website.I stripped it down and started again from scratch.Now,both pups are on until the centre detent,and then both abruptly switch off.I'm going to leave it till tomorrow until my heads cleared a bit.Thanx for your input. Sorry I didn't check the link before posting - my bad - that was not what I meant to post, apologies. Quote Link to comment Share on other sites More sharing options...
KiOgon Posted March 19, 2022 Share Posted March 19, 2022 (edited) I can't get the Seymour Duncan link to copy/paste. Edited March 19, 2022 by KiOgon Quote Link to comment Share on other sites More sharing options...
PaulThePlug Posted March 19, 2022 Share Posted March 19, 2022 (edited) Might Help... MN Taper. www.talkbass.com%2Fthreads%2Fcapacitor-on-a-blend-pot-what-does-it-do.1492092%2F&tbnid=s23JpsyGCZ2-0M&vet=12ahUKEwjjubKXgtP2AhUSi_0HHb0bDlcQMygBegUIARC_AQ..i&docid=QgAko1Ce0ujl1M&w=612&h=792&q=seymour duncan MN blend&client=ms-android-samsung&ved=2ahUKEwjjubKXgtP2AhUSi_0HHb0bDlcQMygBegUIARC_AQ Edited March 19, 2022 by PaulThePlug Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 4 hours ago, PaulThePlug said: What Pot ya got... No ebay link... AC or MN? They are different and wired different.. https://www.ebay.co.uk/itm/254940340729 This is the one I got Paul. 1 Quote Link to comment Share on other sites More sharing options...
itu Posted March 20, 2022 Share Posted March 20, 2022 You could share a pic of your solderings, if that could help us to give you some feasible hints. Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 I'll try.in fact I've already took a pic but because if the reflections on the s/plate,it looks even more confusing.Each wire has a reflected image.I'll try and remove the s/plate and take another.Bear with me.I'm not the best solderer in the world BTW.Bear that in mind😄 Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted March 20, 2022 Share Posted March 20, 2022 That is a very interesting diagram at the top! Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 Heres one to be going on with.S'not very clear,I'll admit. Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 24 minutes ago, Woodinblack said: That is a very interesting diagram at the top! How so Wood? You mean the upside down position of the bell plate?Yeah,its weird. Quote Link to comment Share on other sites More sharing options...
Woodinblack Posted March 20, 2022 Share Posted March 20, 2022 Generally odd. Yes, the upside down position of the plate, the balance before the volume (I guess that is a choice - I would expect it like KiOgons picture), the fact the tone control isn't actually wired to the circuit, but jus relies on the fact you are putting it on a metal plate, ok, it probably works (until you change the plate to plastic) but seems very bad form. I would certainly want a wire there. On to your diagram, as you say it is hard to see because the wires are always in the way in photos, but from your description it sounds like one side is either shorted or backwards. Do you have a meter to check that nothing is shorted out, and that the pickup inputs are only shorted to ground at full travel? Just for clarity, on that dual pot at the top you have the volume pot at the top, one of the inputs (cant see what) in the middle, and a wire that connects to the green wire at the bottom, and on the bottom row, you have that green earth wire at the top, the other input in the middle and and output to the volume at the bottom, is that correct? Quote Link to comment Share on other sites More sharing options...
Bigguy2017 Posted March 20, 2022 Share Posted March 20, 2022 (edited) Two options like these... J Bass blend pot wiring.pdf Edited March 20, 2022 by Bigguy2017 added .png Quote Link to comment Share on other sites More sharing options...
KiOgon Posted March 20, 2022 Share Posted March 20, 2022 I suggest; remove the green wire earth connection from the top lug of the blend pot to the body of volume pot and try it. Cheerz, John Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 Bigguy one thing I've noticed in comparing your pics to the first one I posted is this.The ground wire from the top of the VOL pot goes to the top of the blend pot on your pic,while on the first pic it goes to the bottom right lug on the blend pot.The bottom pic that you posted is like my layout with the Blend control at the top and looks a lot simpler.For a start the VOL control has only 1 wire connected to its l/h lug,whereas mine has 3 wires connected to that lug.Gonna give that a go I think.Cheers. Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 5 minutes ago, KiOgon said: I suggest; remove the green wire earth connection from the top lug of the blend pot to the body of volume pot and try it. Cheerz, John Thanx John,I just noticed that very thing as I posted on Bigguys reply just now.I'll try that.Thanx. Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 Right guys I'll get back to you.John,detaching that wire made a difference,but now one pup is louder than the other,but the blend control seems better.I'm going to try Bigguys diagram tho,as it seems clearer.I'll also need to brush up on my soldering skills I fear.Watch this space,and thanx again. Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 I appear to have an intermittent faulty VOL pot,so theres no point in proceeding with this for the time being.I'm going to order new components and start again.I followed Bigguys diagram (the bottom one) to the letter and its still not right.Could someone just keep me right.250k and Linear or Taper pots.Which? Many thanx for your input guys. Quote Link to comment Share on other sites More sharing options...
KiOgon Posted March 20, 2022 Share Posted March 20, 2022 Always Audio or Log. (same pot/taper), for me (and a lot of satisfied bass chatters), 250K - yes. Quote Link to comment Share on other sites More sharing options...
squire5 Posted March 20, 2022 Author Share Posted March 20, 2022 Cheers John.Thats helpful.I'll get them ordered. Quote Link to comment Share on other sites More sharing options...
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