thisnameistaken Posted May 18, 2011 Share Posted May 18, 2011 I did a series/parallel mod on a Jazz earlier this year, now I've got another Jazz and I'd like to add series/parallel switch to that too, plus a blend pot, so the knobs would go... V (push/pull) - B - T Does anyone have a diagram for this? Cheers, - Kev Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted May 18, 2011 Share Posted May 18, 2011 [quote name='thisnameistaken' post='1235618' date='May 18 2011, 12:57 PM']I did a series/parallel mod on a Jazz earlier this year, now I've got another Jazz and I'd like to add series/parallel switch to that too, plus a blend pot, so the knobs would go... V (push/pull) - B - T Does anyone have a diagram for this? Cheers, - Kev[/quote] I'm not sure you can have "blend" while they are in series. Quote Link to comment Share on other sites More sharing options...
brensabre79 Posted May 18, 2011 Share Posted May 18, 2011 [quote name='Ou7shined' post='1235648' date='May 18 2011, 01:18 PM']I'm not sure you can have "blend" while they are in series.[/quote] It is possible to do, obviously the blend pot does not function when in series. There are a couple of ways to do it, one makes the bass cut out completely when the blend pot is turned all the way to one end. The better way to do it just overrides the blend pot completely but its slightly more complicated. Heres a diagram. For a blend pot just substitute the pickup switch for a pot - same wiring. Quote Link to comment Share on other sites More sharing options...
thisnameistaken Posted May 18, 2011 Author Share Posted May 18, 2011 Er... I'm not sure I understand that. Where are the volume and tone knobs? I am useless at this sort of thing. Quote Link to comment Share on other sites More sharing options...
thisnameistaken Posted May 18, 2011 Author Share Posted May 18, 2011 Also, are volume pots log or lin? Tone pots? I am getting super-conflicting information from people and frankly I don't trust any of them because they're all guitarists. Quote Link to comment Share on other sites More sharing options...
mart Posted May 19, 2011 Share Posted May 19, 2011 The volume and tone controls are not shown on that diagram - they are off the bottom. The two wires at the bottom connect to the outside tags on your volume, and the middle tag and the earth wire are connected to the output socket, with the tone pot wired across them. Putting that another way, take that diagram, with its two wires coming out the bottom, and imagine that as a single pickup. Now take any wiring diagram for a P-bass (or any other single pickup bass) and put that diagram in the place of the pickup. I [i]think[/i] volume pots are usually log and tone are linear, but it won't be a disaster if you get the wrong sort. Quote Link to comment Share on other sites More sharing options...
brensabre79 Posted May 19, 2011 Share Posted May 19, 2011 What he said Volume Pots are LOG Tone are Linear. I assumed you already had these in the bass to connect up to. Quote Link to comment Share on other sites More sharing options...
thisnameistaken Posted May 19, 2011 Author Share Posted May 19, 2011 Well I was planning to replace the two volume pots with a volume w. push/pull 2PDT switch and a blend pot, so the only original pot left will be the tone pot (and I think I'm putting a .1uF cap on that). Thanks for the log/lin info that was really starting to bother me. Quote Link to comment Share on other sites More sharing options...
mart Posted May 20, 2011 Share Posted May 20, 2011 [quote name='thisnameistaken' post='1237587' date='May 19 2011, 11:30 PM']Well I was planning to replace the two volume pots with a volume w. push/pull 2PDT switch and a blend pot, so the only original pot left will be the tone pot (and I think I'm putting a .1uF cap on that). Thanks for the log/lin info that was really starting to bother me. [/quote] Are you planning to use a 3-tag blend pot or a 6-tag pot? Quote Link to comment Share on other sites More sharing options...
thisnameistaken Posted May 21, 2011 Author Share Posted May 21, 2011 [quote name='mart' post='1237725' date='May 20 2011, 08:43 AM']Are you planning to use a 3-tag blend pot or a 6-tag pot?[/quote] Whatever works I guess? Quote Link to comment Share on other sites More sharing options...
mart Posted May 21, 2011 Share Posted May 21, 2011 [quote name='thisnameistaken' post='1239360' date='May 21 2011, 02:52 PM']Whatever works I guess?[/quote] Both work, but a 6-tag blend control gives less attenuation in the middle position. But it's probably more expensive and takes twice as long to wire up. Quote Link to comment Share on other sites More sharing options...
thisnameistaken Posted May 21, 2011 Author Share Posted May 21, 2011 I'm not bothered about another half hour soldering or a few quid if it does the job properly though. Quote Link to comment Share on other sites More sharing options...
mart Posted May 24, 2011 Share Posted May 24, 2011 Fair enough. If you want help wiring up a 6-tag blend control, then just copy the first diagram (SP RB 127R) on this page: [url="http://www.warwick.de/modules/infos/info.php?rndtop&katID=17090&cl=EN"]http://www.warwick.de/modules/infos/info.p...17090&cl=EN[/url] Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted May 24, 2011 Share Posted May 24, 2011 [quote name='brensabre79' post='1235680' date='May 18 2011, 01:38 PM']It is possible to do, obviously the blend pot does not function when in series. There are a couple of ways to do it, one makes the bass cut out completely when the blend pot is turned all the way to one end. The better way to do it just overrides the blend pot completely but its slightly more complicated. Heres a diagram. For a blend pot just substitute the pickup switch for a pot - same wiring.[/quote] Mine uses a variation on the above but it was complicated by the fact that my Schack pre-amp requires 2 inputs or silliness ensues. I got around it eventually though by sending 2 series signals to it. Interestingly now, in series mode, it boosts the centre/both selection (while the outer selections remain the equal to eachother) of my 3 way pup selector - an unexpected benefit. This one is different but might be simpler to follow - just send the two red outs to either stage of the blend... but again as I mentioned earlier, I think there will be blending issues when you knock them into series as one end of the blend will be dead. Quote Link to comment Share on other sites More sharing options...
thisnameistaken Posted May 24, 2011 Author Share Posted May 24, 2011 Ah right. Hmm this isn't as straightforward as I thought it would be. I definitely want to stay passive though, maybe I'll knock the blend idea on the head. Quote Link to comment Share on other sites More sharing options...
Monckyman Posted May 24, 2011 Share Posted May 24, 2011 I`m going to give it a try, although the series switch wasn`t in my plans. I quite like the look of that diagram as it has tone pots for both pickups, that makes loads of sense to me, being able to roll the front pickup tone off but keep the bridge open or vice versa. That sort of makes the blend a giant tone control. Does mean sticking the input socket on the arse though which I`dont mind on the bitsa, but not the MIM. Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted May 24, 2011 Share Posted May 24, 2011 [quote name='Monckyman' post='1243189' date='May 24 2011, 05:41 PM']I`m going to give it a try, although the series switch wasn`t in my plans. I quite like the look of that diagram as it has tone pots for both pickups, that makes loads of sense to me, being able to roll the front pickup tone off but keep the bridge open or vice versa. That sort of makes the blend a giant tone control. Does mean sticking the input socket on the arse though which I`dont mind on the bitsa, but not the MIM.[/quote] Those are volume pots. The one with the cap is your tone. What you stick in the arse is none of my business. Quote Link to comment Share on other sites More sharing options...
Monckyman Posted May 24, 2011 Share Posted May 24, 2011 Ah but... with a blend you won`t need two vols.. so you could have two tones. No? Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted May 24, 2011 Share Posted May 24, 2011 [quote name='Monckyman' post='1243617' date='May 24 2011, 10:49 PM']Ah but... with a blend you won`t need two vols.. so you could have two tones. No?[/quote] In theory... but not really because in order for them to work independently you will have to have your tone pots before your s/p switch. What then happens when you switch them to series? Uh-oh two tone pots on the same line. You could set a switch to by pass one of the pots but then your simple DPDT switch just became a whole lot more complicated. Quote Link to comment Share on other sites More sharing options...
Monckyman Posted May 25, 2011 Share Posted May 25, 2011 OK, but I wasn`t intending fitting a series switch, that was the OP. If there was no complications from a switch would the two tone thing work? EG: Master Vol/Blend/Tone neck/ Tone Bridge. Are there any basses set up like this? Apologies to OP for the hi-jack, am hoping this is all relevant to him too. MM Quote Link to comment Share on other sites More sharing options...
mart Posted May 25, 2011 Share Posted May 25, 2011 [quote name='Monckyman' post='1243932' date='May 25 2011, 09:42 AM']OK, but I wasn`t intending fitting a series switch, that was the OP. If there was no complications from a switch would the two tone thing work? EG: Master Vol/Blend/Tone neck/ Tone Bridge. Are there any basses set up like this? Apologies to OP for the hi-jack, am hoping this is all relevant to him too. MM[/quote] Yes, Vol/Blend/Tone/Tone is fine. The link I posted above (diagram SP RB 127R on [url="http://www.warwick.de/modules/infos/info.php?rndtop&katID=17090&cl=EN"]http://www.warwick.de/modules/infos/info.p...17090&cl=EN[/url]) has exactly that config. Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted May 25, 2011 Share Posted May 25, 2011 [quote name='Monckyman' post='1243932' date='May 25 2011, 09:42 AM']OK, but I wasn`t intending fitting a series switch, that was the OP. If there was no complications from a switch would the two tone thing work? EG: Master Vol/Blend/Tone neck/ Tone Bridge. Are there any basses set up like this? Apologies to OP for the hi-jack, am hoping this is all relevant to him too. MM[/quote] Yep that's totally doable. Quote Link to comment Share on other sites More sharing options...
mart Posted May 25, 2011 Share Posted May 25, 2011 [quote name='Ou7shined' post='1243634' date='May 24 2011, 10:58 PM']In theory... but not really because in order for them to work independently you will have to have your tone pots before your s/p switch. What then happens when you switch them to series? Uh-oh two tone pots on the same line. You could set a switch to by pass one of the pots but then your simple DPDT switch just became a whole lot more complicated.[/quote] How much of a problem is it to have two tone pots on the same line? Doesn't it just give a wider range of tone roll-off? Or is there some loop problem? Quote Link to comment Share on other sites More sharing options...
Ou7shined Posted May 25, 2011 Share Posted May 25, 2011 [quote name='mart' post='1243963' date='May 25 2011, 10:07 AM']How much of a problem is it to have two tone pots on the same line? Doesn't it just give a wider range of tone roll-off? Or is there some loop problem?[/quote] The one would choke the other. Say you have one set to fully roll off the treble, what can the other one do? Nowt. Not to mention the relative ineffectiveness of having two caps bleeding your signal to earth at the same time - ok you just half their value. In an active EQ circuit there is no problem, as you preselect isolated frequency ranges and boost or cut that specific frequency range without affecting other frequencies - you could probably even have two pots selecting the same frequency ranges and produce a strange (probably unusable) compressed tone by cutting one and boosting the other. In passive circuit you can only remove top end not add anything (there is one exception - a bit of crazy wizardry that effectively produces a passive bass boost... and I use it in my circuits. ) Quote Link to comment Share on other sites More sharing options...
mart Posted May 25, 2011 Share Posted May 25, 2011 [quote name='Ou7shined' post='1243981' date='May 25 2011, 10:29 AM']The one would choke the other. Say you have one set to fully roll off the treble, what can the other one do? Nowt. Not to mention the relative ineffectiveness of having two caps bleeding your signal to earth at the same time - ok you just half their value. In an active EQ circuit there is no problem, as you preselect isolated frequency ranges and boost or cut that specific frequency range without affecting other frequencies - you could probably even have two pots selecting the same frequency ranges and produce a strange (probably unusable) compressed tone by cutting one and boosting the other. In passive circuit you can only remove top end not add anything (there is one exception - a bit of crazy wizardry that effectively produces a passive bass boost... and I use it in my circuits. )[/quote] Ok, that makes sense. Thanks. Quote Link to comment Share on other sites More sharing options...
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