I've just been doing a quick test of my breadboarded Rangemaster Circuit with my oscilloscope and signal-generator, and I think I have discovered something which I thought I would share with you guys, firstly, my signal generator has a Low-Impedance output (I think it's something like 50 Ohms), okay now you might be wondering why I mentioned that?, well as we know the output impedance of an electric guitar with passive pickups, say a Fender Stratocaster, tends to be fairly high, I'm guessing that it's the combination of the pickup's impedance in parallel with the DC resistance of the volume control, say 250k for argument's sake, I'm probably wrong though, well 50 Ohms is a fraction of that, I've read that the Rangemaster seems to act more like a midrange boost rather than a treble boost, and I think I know why, the input of the Rangemaster appears to be loading the output of the guitar and causing a loss of treble frequencies, I found that when I connected up the output of my signal-generator to the input of the Rangemaster, the circuit did indeed behave like a treble booster, my conclusion is that to get the circuit to work as a treble booster, you need to put a buffer in between the guitar and the Rangemaster's circuit....
You could implement the buffer as an additional Germanium transistor connected as an emitter follower, or you could use a P-Channel J-Fet (for a positive ground circuit using an OC44)...
I swept the signal-generator frequency from about 100Hz to 10kHz, and found that at 100Hz I had about unity-gain (input cap was a 4n7 and a 1nF in parallel making a total of about 5n7) when I swept the frequency up to 10kHz, the gain steadily increased until it was at maximum at 10kHz, here's a list of the components I used:
Resistors:
X1 4k7/ 5% 1W Carbon Film.
X1 68k/ 5% 1W Carbon Film.
X1 470K/ 5% 1W Carbon Film.
Pots:
X1 10k 24mm Alpha.
Capacitors:
X1 1nF.
X1 4n7.
X1 10nF.
X2 47uF/63V RB Electro.
Transistor:
X1 OC44 Hfe= 70 Leakage Current= 0.340 mA (As currently measured by my semiconductor analyzer).
Supply Voltage= -9.14V
Transistor Collector Voltage= -3.52V
Input Signal Level (Sine Waveform)= 140mV Peak-To-Peak (Note: Signal level was kept constant).
Output Signal Level At 10kHz= 6.5V Peak-To-Peak (Note: The output waveform was slightly clipped on the top half).
Genius is not all about 99% perspiration, and 1% inspiration - sometimes the solution is staring you right in the face.-Frequencycentral.
); sadly the rat sounded bad with the vht, so I sold it (it was a chinese one, so nothing to cry about).
Most OC and japanese types worked well for me. Q1C voltage didn't change much at all. Did you have the volume pot turned down when you measured?
