[sdiy] oscillator jitter / phase noise

[Czech Martin]

Just some idea:

In some old postings it was said that "old" vco designs
"could" sound better because there is some random process
leading to phase noise/jitter.

This would then lead to very interesting phasing pattern,
if two or more oscillators beat against each other.
Obviously a quartz stabilised oscilator, DCO or software
oscillator will not have this feature.
To me it seems the only explanation, since the actual
waveform is not very important (after my experiments).

For the phase noise I could imagine current source noise,
integrator noise and perhaps most important comparator
noise. Also noise on the power supply comming from other
modules could be considered.

Anyway, has this ever been investigated?
What do owners of old gear say?

If not, what would be needed to investigate this?
Would a very long audio sample be sufficient to make 
statistics and meaningfull spectral measurements?
Or is the usuall 20kHz + bandwith too limited? 

m.c.

(currently very busy with room acoustic measurements, i.e.
room impulse response measurements)