Coil tap switch for SR 705

if you use your pickups in single coil mode, be sure to tap out a south coil from one and a north coil from the other. this way they'll hum cancel when your blend is in the middle.

push-pull pots are available in many values these days so there's a good chance you won't have to drill an extra hole. it should only take a single pole to coil tap, and push-pull pots virtually all feature double pole switches so you can have one switch for both pickups.

there may be fitment issues. you may have to remove a pot from a circuit board. perhaps you could post some pics of the electronics.

if you plan to have the pickups wired in series, you'll have a notice volume drop when you switch to single coil mode.

 

Those are not tapped pickups. You can't do any coil tapping. You could do coil splitting, or series/parallel switching, however.

 

If you want series/parallel/single switching, you'll likely need to go with a switch. If you want to stick to push-pull knobs and not modifying the looks of the controls, you'll have to choose 2 modes.

I added a series/parallel/single switch to my Ibanez GWB35 with a Bartolini NTMB preamp and a Bartolini pickup, much like the setup you're discussing here. With only one pickup and two knobs, things weren't crowded in the control cavity.

Series is appreciably higher output than parallel and single, and the biggest tone jump too.

 

I did. It's a SR905. Chrome switches are pickup coil selectors. Black one is MID freq. center selector. All three of them are DPDT on-on-on mini toggle switches.

 

Nice work, but the pots are not grounded properly. There should be a ground wire daisy chained across the back of each pot. It will keep things working if a pot comes loose.

 

Is that the HR-5.4AP/918 prewired set or is it the HR-5.4/918 (no active-passive push-pull vol pot) prewired set? Seems you have the AP version (so the volume pot is already a push-pull pot), right?

I have no idea that there is such a push pull balance pot. Even if it exists, I'm imagining it would be too tall and wouldn't fit inside your SR series electronic cavity.

So your best bet would be changing one or two of the EQ pots to push pull ones.

 

I thought that BestBassGear used to have push/pull blends, but I don't see any on their website any more. They are the only retailer that I know of, which carries certain exotic pots. Indeed, a push/pull blend is a rare item.

 

even if OP is able to get one, still it might be problem, looking at OP's picture of which the (common) volume push-pull pot seems almost as tall as the electronic cavity depth.

 

but will it fit the cavity depth?

secondly, you need to find the type of taper and value, which best resemble taper and value of the balance pot of your HR-5.4AP/918 prewired set.

 

Yeah, it looks like your bass has the output jack at the front so, the different cavity space. Mine has a side jack.

Correct, only two choice with a push-pull switch.

Yes they are. I like them, especially the versatility I get by switching coils and mixing them together.

 

Actually, to me, this is the proper way of grounding the pot cases, by touching the shielding foil. I hate to see solder blobs on the pot casings. You never know who did it, how did it (Schrodinger's pot?)

Besides, this is my bass and I've done it myself. If a pot comes loose I'll fix it. But there are internal tooth lock washers under every pot. I don't think they will come loose easily. I know, everyone treat/abuse their instruments differently but in my case it's been years and they're still tight in their place.