Uranus phaser

[R.G. Keen]

>>By the way, I did finally hear a reasonable suggestion for why the
>>univibe has the phasing capacitor values staggered like it does, which
>>had always mystified me. The original 'vibe also had a "Vibrato"
>>setting. If you set the caps to all the same value, the phase shift is
>>all concentrated in one spot. With the large staggering of phase shift
>>values, there is some phase shift at the top and bottom end of the
>>audio spectrum to provide vibrato even at the extremes of the swing.
>>That made far more sense than any other explanation that I had heard or
>>could come up with.
>
>This is a long shot, but do the values make the spacing intervalic instead
>of linear (or a some rough approximation thereof)? That would definitely
>make it sound more like real vibrato 

The phase capacitor values are 0.22uF, 0.015uf, 470pF, 4700pF. For
continuous coverage of frequency, you probably need caps on decade
boundaries, which one set does have, but the others are not related 
by decades, octaves, musical intervals, arithmetic or geometric
progression, or phase of the moon that I can see.