Broadcaster wiring with bridge/neck blender in series

[hazymous]

Hi guys, I'm looking for a diagram of broadcaster wiring but with the blend knob in series

i looked everywhere on internet and i only found these :

pickups in series in position 2 without blend knob

and the broadcaster wiring which has the blend knob but wired in parallel

 

Vox humana guitar company have this in series blend knob but it's a third knob they added to the tele control plate, and they don't want to communicate any info on their circuitry..

your guys are my last hope !

[Yogi B]

This is what I'm thinking, schematically:

The additional (18k) resistor is there to hopefully give a more useable taper with a log taper pot (e.g. if reusing the stock tone pot), but may not be the optimal value. Plus, adding a cap of a few nanofarads (say, 1n — 3n3) in parallel with that resistor will add a little bit of treble to the intermediate settings — but with 18k already being a fairly low impedance this won't add a great deal, so not essential.

Similar to the first diagram you posted, running the pickups in series means that you'll need separate signal & shield grounds for one pickup. However, unlike that diagram, mine would require this be done on the bridge pickup (rather than the neck).

[hazymous]

thank you yogi, you're the best !

i'm gonna try that within few days since i'm still waiting for the pots and switch to come,

have a nice week -end !

[JohnH]

I love me a series wiring, and there are a few different basic variations, which can be subject to a personal choice.

This is a good diagram and it can be easily adapted to try them.

With single coils and one pickup on, the other being blended in in series, my favourite after quite a lot of testing was a direct series connection from hot, through both pickups, to ground. Then the blender acts as a variable resistor to shunt one pickup. I found this to give the clearest series tone since there is a direct route through the pickups that does not involve going through a resistor. For Yogi's diagram, this can be tried by replacing the 18k with a wire link. So ideally, you can build the 18k in, and then have a wire to try shunting it, or not. You might like it either way.

Or, adding a cap across the 18k is worth a try, I agree with Yogi's starting value.

Or, can also try changing the 18 k to 120k in parallel with a 1nF cap, like a treble-bleed circuit - this works on my LP

Also, this diagram has bridge fully on, with neck blended in. On my Strat, I like it with neck fully on and bridge blended in - its a choice.

A 250k log pot is a good choice for the blender. The series blending action will be controllable though mostly in the first half turn (0 to 25k), then a tad more in the second half. I find this to be fine. On the Strat, I use a no-load 250k log, but by the time it gets to max, there's no more audible change as it goes to goes no-load. The only other option that Id consider would be a 100k log pot, and then cut the track to make it no-load at 10. Same tonal range though.

Good luck!

[newey]

Will someone please correct me if I'm wrong, but on the first diagram (without the blend pot), is the blue jumper wire between the poles of the 3-way switch not going to the wrong lug? Shouldn't it be wired one lug over to the left?

Also, the neck is hanging from hot when the Bridge pickup is selected.

IOW, like this?

[reTrEaD]

Jul 9, 2023 7:02:27 GMT -5 newey said:

Will someone please correct me if I'm wrong, but on the first diagram (without the blend pot), is the blue jumper wire between the poles of the 3-way switch not going to the wrong lug? Shouldn't it be wired one lug over to the left?

Yes, that problem can be corrected in any of the three methods shown below:

Jul 9, 2023 7:02:27 GMT -5 newey said:

Also, the neck is hanging from hot when the Bridge pickup is selected.

Yes, that is necessary because there are only two poles with which to work. Shunting the Neck pickup in when the selector is in the Bridge-only position is not a good fix, imo.