Just built range master....need help!

[Headbuttking2]

Alright even though this is the easiest circuit imaginable i think I still managed to f it up..

Anyways I built the this and it has 0 gain, I have to turn my amp almost all the way up to hear anything even when the range master is turned all the way up.

I am using it as a regular pedal to a solid-state amp for testing purposes because I have not gotten my tube amp yet. Could this be the problem?

Another thing is that when I set Rb1 and Re, I used the regular ground (-9v in this case) when measuring the voltage between the collecter and ground.
I got + 7 V instead of negative (but I could have had the DMM probes reversed).
When I tried doing it between the +9V (actual circuit ground) and the collecter i could not get above -4.5 volts when I used a 10k and 100k pots for Re and Rb1.

I got the ger. transister (CV7112) from DIYstompboxes.....could it be too leaky to use?

Please help!

Thanks in advance.

[hairyandy]

I have a feeling that you have an issue somewhere regarding ground and your transistor.  The CV7112 (or OC140) is an NPN transistor and should be used in a negative ground circuit.  The original Rangemaster is a positive ground circuit, unless you've used an NPN schematic or layout the CV7112 won't work right.  Try checking out Phillip's Rangeblaster at Fuzz Central or Dragonfly's NPN Rangemaster layout in the Layout Gallery for examples.  The Rangemaster should have tons of gain and is capable of peeling the paint off your walls!

Hope this helps...

[Headbuttking2]

Ahhhh

My mistake..

Thanks, I think I will just purchase a PNP one from Small Bear.

[petemoore]

  All that is required is to flip the polarity of any polarized components, battery, Electrolytic cap and Reverse polarity protection diode if you've used one.