Rangemaster mod help

[ESPm2M]

Hi everyone! I am new to the forum and would like to introduce myself - my question arrives in paragraph three.  I have been playing guitar for going on nine years, am becoming more of  a tone freak every day, and have gone through many trying periods of G.A.S. in the past in search of "my tone" (just good tone in general really).

I having been moding and otherwise customizing my guitars on occasion for years - I HIGHLY recommend Bill Lawrence pickups and q-filters (//www.billlawrence.com).  I am just recently entering the realm of effects mods and DIY effects projects, tube technology (amps).  My first three projects will be to mod a RAT (per  http://www.diyguitaramp.com/rat.html), to build a Rangemaster clone with a tone range switch, and to build an Orange Squeezer with panel mounted controls (instead of inner trimpots).

This brings me to my qestion.  My first actual DIY project will be a Rangemaster clone (a gritty germanium treble booster as many of you know all too well).  I want to wire in a switch effectively enabling me to select treble boost, mids boost, or bass boost. Based on the project layout file available at GGG (http://www.generalguitargadgets.com/v2/diagrams/geb_rm_lo_pp.gif), which resistor, or other component, do I need to wire to the off-board switch?  What type of switch would I need? An on-on-on sub-mini? And what resistor values would I need to wire up to that switch to achieve the desired results (obviously I would keep the original value for the treble side of the switch).

Thanks in advance, and very nice to meet all of you!  

ESPm2M

[bwanasonic]

If you haven't done so already, read the rangemaster article at www.geofex.com . The part you vary for different response is the input cap. Smaller cap raises the frequency range boosted, larger cap lowers it. The GEO article explains this well and gives a guide to what kind of cap values to use. If you plan on using the RM with mainly one guitar and one amp, you may find that you just need one setting *tuned* to your setup. I find the more-or-less stock values to be pretty versatile with both my Strat (w/ Bill Lawrence 280s) and Les Paul.

As for the Orange Squeezer, it works well as a One Knob Wonder. The bias pot is really more of a *set-and-forget* control, with a fairly small range of usable adjustment.

Have fun

Kerry M

[petemoore]

The OS pot inside, on mine, can be run through it's entire range, and no noticable difference in function...
 The rangemaster incap mod,...You can pick your 'thin cap sound, then add another cap in parallel for your 'fat sound, and use an SPST switch to add/subtract the paralleled cap.
  Otherwise you could use a switch the chooses one of three poles 'in' and one throw 'out' [out being the circuit side], and wire the three differently voiced input caps...one side to the input switch or jack [if your not useing a bypass switch] the other side of each of the three would go to one connection of the switch...

                         CAP 1
 INPUT JACK      CAP 2   >switch picks one at a time>...circuit
                         Cap3
  Hope this Helps...

[ESPm2M]

petemoore, I'm going to go with your advice and buy two caps and an on-off-on SPDT switch.

The only problem is that I have no idea what cap values to go with in order to achieve this.  The original input cap is 0.005 uF. can someone please recommend from experience what the other two values would need to be to achieve this range switching?

TIA!