Dan Armstrong Red RangerVerified

From the post

Not a lot of demos about these nice little circuits. Anyway. Dan was a great man. One of my idols. If you're not familiar with the man and his work, you could check out http://www.danarmstrong.org/

I just built this one too and it's really great sound heater. Something you might want to leave on all the time when you play. So it is verified.

It has a three position switch which allows the user to select a full-range level boost or to boost either the bass or treble range to change the tone of the instrument. In the "Full" position the Ranger provides 13 db of clean boost across the full frequency range; this can be very useful with inexpensive or low-output instruments in fattening up the sound or inducing amplifier dis­tortion. In the "Treble" position the Ranger produces an additional 12 db (25 db total) of boost in the treble range, while in the "Bass" position it boosts the bass range a total of 22 db without holding back the treble. The "Bass" and "Treble" positions are similar to regular tone controls except that they operate by boosting the desired frequencies rather than cutting out the undesired ones. The Red Ranger also features a low 300 ohm Output Impedance in all three switch positions to eliminate signal loss and hum pick-up in long cables. Input Impedance is 110 k Ohms and the Signal-to-Noise ratio is 85 db.