Ok I have decided to build one of these.
From searching info on this device I have discovered that these things can be very noisey and also crackle when the pot is turned due to DC on the wiper. If so I don't want to make this Is there a modified circut around. Surely putting a cap after the wiper would block the DC anyway ?

Where is the best place to purchase a kit for these ?

Cheers

I've actualy build 6 or 7 RangeMasters and I've never had any problem with the "crackling" of the "boost" pot as it's turned.  I'm not sure if I'm doing something special...I usually use the 10KA 16mm mini pots from Steve Daniels.  I've also used a 10KA 24mm regular size pot from Mouser...no crackling problems at all.

I wire lug 1 to -9VDC, lug 2 has the 0.01uF capacitor to output, and lug 3 goes to the collector of the transistor.  I put a 1M pulldown resistor on the output side of the 0.01uF output capacitor, so that might have something to do with it.

Phillip

Which schematic are you working off ?
And where do you get your transistors from
Also do you add a trimpot to have the correct biasing ?


Cheers

Transistor picking is tricky, depending on if you want 'the original' Rangemaster sound [whatever that is]. They used OC44's, I gave up on finding a 'good' one of those, Theyre our of production for so long.
 Small Bear has suitable transistors for the circuit, or you can try PNP germanuims of your sourcing....NTE158 works, I've got an old SB??? transistor from long ago that I like, and an old SS radio from the 60's? that has 7 vintage Ge's...look real nice, and do the SS radio from the 60's sound thing still, I haven't had the heart to destroy it and salvage them.
 VOX Treble Booster is another 1Q, Ge, booster. I like that one too.
 I have a Rangemaster setup jig on perfboard, with all resistors replaced with V/R trimpots, and caps socketted. This makes interviewing transistors for bias/sound possible quickly...by measuring the pots resistance, and building a 'clone' of that circuit around the chosen transisor with fixed resistor and cap values taken from the test jig.

I use the "RangeBlaster" schematic that's on my Fuzz Central website (see link below).   The transistors that I use on the RangeBlaster are usually either 2N388 NPN Ge. or SK3861 NPN Ge.  Those two values are nearly impossible to get ahold of now...I got lucky a while back when I got them.  The electronics department at a local college was going to throw them out, but I grabbed all the Ge. parts that I could get my hands on.  Unfortunately I've gone through all the good ones.  If you build a PNP version of the RangeBlaster, you'll need to reverse BOTH diodes in the circuit (1N4001 and 1N34A), reverse the electro. caps, and reverse the battery leads.  

I use the Ge. transistor checker setup and RG Keen's GEOFEX to test for suitable devices, so I don't use a trimpot to get the biasing right...I just use the standard RangeMaster values.

Like Pete mentioned, I would get a pre-tested PNP Ge. transistor from Steve Daniels of Small Bear Electronics...huge time saver.

Phillip