Switch for ROG Tonemender?

[Pakaloabob]

Just a quick question: what kind of switch is used for mid-shift on the Runoffgroove Tonemneder? I did some searching but couldn't figure it out myself.

[B Tremblay]

DPDT, on/on

[Pakaloabob]

Thanks for the quick reply!
Are two of the lugs left open?

[B Tremblay]

Yes, one lug of each pole is not connected.  If you're using the official PCB layout, here's the wiring.

[Pakaloabob]

D'oh! I should have thought to look at the PCB layout, even though I am planning on doing it on perf.
Thanks for the help and thanks especially for all the great projects on your site - I have built at least a dozen of them and love each one!

[Mark Hammer]

Incidentally, as is the case with all Fender-style tonestacks, a boost can be achieved by simply lifting the connection between the midrange control and its respective ground (Vref in this case, but ground in an actual amp).  The Tonemender uses a combined pot+parallel resistor to achieve its control response, so you could lift the ground connection for either the pot, the parallel 100k resistor, or both.  Either way, you would change the effective resistance to ground for the tonestack to a higher value and bleed off less signal.

I'll take a step back for the uninitiated here. The tonestack "works" by selectively bleeding off parts of the signal.  It does not offer any boost, only the sorts of cut that make it seem like more of this or that has been added.  When the path to ground is higher resistance, there is less bleed-off and more signal retained as a result.  Since the pot+resistor combo will never be greater than 50k (100k + 100k in parallel), there is a lot of bleed-off, and plenty of space between 50k and complete open circuit.  Any increase beyond the stock 50k max will result in more lower mids and upper bass, and a hotter overall signal.  I did this to an old blackface Tremolux, after reading about the mod in an issue of POLYPHPNY 25 years ago, and it was a nice added feature, and great for solos.  The nice thing is that since it is entirely passive, you get the simulation of extra gain without having to create it.

So, a person could install a Tonemender in a box amenable to dual stompswitches, and have one for bypass, and another for "fatter" boost that would increase the resistive path in any of the ways noted earlier.  The kind of tonal/level adjustment it would make would depend on the amount of resistance change.  If you don't like it "open circuit", you could have a 220k resistor (or whatever) in parallel with the pot+100k.  Lift the connection for both pot+100k and it would now revert to a 220k resistance to ground rather than open circuit.

Finally, while the mod tends to disable the bass and mid controls, it does nothing to the treble control.

[Pakaloabob]

Mark, that sounds like a great idea!
I appreciate the n00b background info as well in your description. I admit it took me a few reads to wrap my brain around the concept, but I think I get it. Basically the "boost" would just mean I would lose minimal signal from the mids while the treble and bass are being bled-off.
Thanks for the input. Always great to get personal tips from a pro like yourself