Rangemaster trouble?

Discussion in 'Pedal/Effects Owners Clubs' started by DucDone, Feb 11, 2019.

  1. DucDone

    DucDone TDPRI Member

    Apr 9, 2011
    Hi. I am trying to put together this Rangemaster, I get sound, but it's almost like a no booster, very low. Does anyone see a probable cause for this in the picture? I have built it twice, same result. (I am using a SFT308 transistor. The base seems to be the one in the "middle", at least that's the only place there is sound. It's seems difficult to find a proper diagram for it.) The only thing that I might be unsure about, is where the grounding goes, the pic doesn't say. I have taken a ground from the input jack to the strip ground point an another from the same jack to the ground on the other jack. Ok or not?

    Attached Files:

    Last edited: Feb 11, 2019
  2. fraser

    fraser Tele-Holic

    Sep 8, 2007
    Hamilton, Canada
    Are you getting correct voltages at the transistor?

    My first build was the range master.
    For a simple circuit it caused me much frustration.

    Sounds like the transistor is passing signal but not turning on.

    I would check it’s voltages.
    Did you just follow the schematic for part values?
    The collector resistor May need adjustment,
    I use a pot there to determine the correct value.

    Maybe the transistor is faulty or unable to bias correctly as well.

    If you haven’t already, check out the geofex.com article
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