Ken Baker wrote:This is part of a discussion of converting a Stew-Mac 500K dual concentric pot to 250K/1MIs there a way to convert a 500k/500k stackpot into a 250K/1meg, so can use it as a stacked t/b control?
Taking a 500K pot and reducing its value is, as noted above in this thread, a simple matter of networking in parallel resistance. You just have to remember that the curve will not be precise; but while the curve isn't pretty, the pot/resistor combo will still vary resistance from zero ohms to whatever its modded value is.
Increasing the value would mean adding resistance in series with the pot, which means that the max value will be as you want it. However, when you crank back the pot completely, the least resistance it will show the circuit will be the value of the resistor you added in series. It will not reduce resistance to zero ohms as it would if the series-connected resistor weren't there.
Gil Escalera wrote:Hey John,
Dave's post above (daveplaysbass on Sun Mar 04, 2007 10:08 am) has all the information necessary to wire the SC option. You can also obtain the three position switch from Butch Ammons (Bayou Cables) if you want to go Series/Single Coil/Parallel.
Silverbass wrote:gawd damn the pusher man
Thanks for the wonderful L-2000/2500 wiring diagram.
It came in real handy today when I shielded one of mine, earlier today.
Can't hear the local AM radio station through it anymore.
rsnell22 wrote:More on my L-2500 shielding :
I went the copper foil route, with all the pieces of foil connected with solder.
When I removed the pickups, I found that there wasn't enough room for foil on the sides of the cavities, and that there is already a grounded plate on the bottom of the pickup. I did not (for now) add any shielding to the pickup cavities.
I'll get back into it if I have to, but the slots were so tight that it would require removal of some wood to allow for the copper
foil to not be binding on the pickup case.
In the control cavity, I soldered a wire onto the shield and landed it at the ground terminal on the cover of the volume pot. That puts it right at the pickup and preamp grounding point. I'm not so sure that a star grounding approach would do much better.
Right or wrong, that's what I did, and the bass is definitely more quiet. The real test will be when I take it back to the noisy building.
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