Filter: Bass

| SeleKtion →


On the VEKTOR (dropping the “Mk II”) front:  the near-final version is made out of 113 components.  Selecting actual parts today.  The first edition/run will be a through-hole design on good old green masked PCB with high quality, hand picked and placed components.

Gearing up to build an estimate.

| VEKTOR Distortion →


I have a capture from my scope here that shows the output of the buffer transistor immediately after the clipping section on one of the VEKTOR Mk II channels.  The blue trace is the input to the circuit being generated by my bass as a sustaining E on the 1st string with the tone turned down to emphasize that nice fundamental sine-wave.  The yellow trace is the output of the not-starved buffer transistor on the symmetrical channel.


Here the is the same scenario (I am playing a lower note) but after the tone contour section in the same amplifier channel.  You can see how the tone contour circuit distorts the signal as it emphasizes certain frequencies by bypassing others.  Notice that the distorted output waveform shows a higher frequency content than the input waveform: this is a visual demonstration of clipping harmonics in an audio signal.  It shows how hard transitions in signal voltage can introduce higher frequency information into the signal.

You can also clearly see the fundamental under those partial spikes.  This particular distortion shape is tracked flawlessly by my 3Leaf Audio Octabvre.  Concerning guitar and bass distortion, this is octave food.

I’m working on massaging the noise floor and fine tuning the gain steps.  VEKTOR will never be totally quiet at high distortion ratios but I would like to minimize noise for gentle-effect usage on the left half of the ratio (blend) control.  I’m also concerned about noisy power supplies.

Read: A Musical Distortion Primer