Discrete Tube Phaser

[Nils Pipenbrinck]

Folks, it's really simple:

You can build a tube-VCF with Lowpass, Highpass and Bandpass, right? Add
together the outputs of low, high and bandpass and make sure the resonance
is not audible (or build your filter without resonance at all). Then you
have a voltage controlled phase shifter.

If you cascade a couple of this filters, and connect a simple sine lfo to
the control voltage you'll end up with a nice flanging effect.

I've tried that in software with a cheap 6dB lhb-filter (3 lines of c-code).
For a test I programmed two banks of each 3 phase shifters in a row and
added the signal of the two banks together.. That was a very strong phasing
effect. It sounded very "digital" because my 3 line of c-code filter suffers
from aliasing, but it showes, that in theory it should work.

Btw.. Using LDR's is cheating.. I'm not sure, but aren't LDR's made of
silicium or germanium or another "modern" material?

Nils