Question in regards to treble bleed resistor

[kleuck]

I've seen people replace the tone pot with a rotary switch that selected a bunch of different capacitors, or RC networks or whatever.

I do the same with push-pull pots to lower the resonance frequency, turns a P90 in a decent Humbucker (except for the hum cancellation)

[Chuck H]

There's no rule about how complex the circuit can be. You could use a 1000pf in series with a 220k, then parallel a 330pf across that 220k, then parallel that curcuit to another 220k resistor. Now you have a smaller effect from the 1000pf cap and all the effect of a 250pf (1000pf in series with a 330pf = 248pf). If that's too much 250pf you could add another, say, 100k resistor in series with the 330pf cap in the circuit. It can start getting silly, I know. But it depends on how far your willing to go. Different results CAN be had.

[pdf64]

The method that Kinman puts forward seems to be to match the bleed cap to the capacitance of the cable being used (eg ~1n2F), then add a series resistor of about half the pot value (eg 130k).
I find that a low capacitance cable (eg George L) makes this type of thing unnecessary though.
Pete

[kleuck]

I do not agree, i use low capacitance cables (ie : Sommer Spirit, 78 pf/meter, and i measured the same) and the effect of a treble bleed is still here.
At least with Teles, P90 and mini-humbuckers.

Edit : i use 4 to 6 meters, so it would turn in 13 to 20 feet.

[daz]

There's no rule about how complex the circuit can be. You could use a 1000pf in series with a 220k, then parallel a 330pf across that 220k, then parallel that curcuit to another 220k resistor. Now you have a smaller effect from the 1000pf cap and all the effect of a 250pf (1000pf in series with a 330pf = 248pf). If that's too much 250pf you could add another, say, 100k resistor in series with the 330pf cap in the circuit. It can start getting silly, I know. But it depends on how far your willing to go. Different results CAN be had.

Thats basically the kind of thing i was thinking of. But i'm burned out for now and will try it when i feel up to more of this PITA. Next time however i'm doing the hang the wires out thing. Might rig up a 220p and the 1000p with trim pots in parallel with each and a trim in series with each ! That should end this fiasco once and for all !

[pdf64]

Well, capacitence wise that works out a little better than my George L (~390pF, 15ft).
I've got 250k volume pots in all my guitars, except for the Les Paul, which has 300k pots on the Burstbuckers.
I think the combination of low capacitence cable and 250k volume controls helps to keep mid setting treble loss to a acceptable level, for me at least.
Pete