Phase 90 or Ross Phaser - Which is better??

[Govmnt_Lacky]

Recently i came into some 13600 ICs and was thinking about building a Ross Phaser. I have built quite a few Phase 90s and would like to know how they compare.

Soliciting testimonials 

[LP Hovercraft]

The Ross Phaser is a great use of LM13600 OTAs.  It is a lot like a Small Stone with a slightly higher range of sweep and a hypertriangular LFO.  There are some wonderful posts by Mark Hammer regarding mods.  This as a six stager sounds very nice.  How it compares to the Phase 90 is rather subjective, but I would say I could do a convincing version of "Breathe" with a 4 stage Ross.  It will also handle larger signals before clipping than the 90.  One thing that the 90 has on the Ross is that the 90 is better sounding on bass guitar IMO for some reason.

[Mark Hammer]

The notches tend to be located differently on the P90 than the Ross.  The LFO waveform is different as well.  The Ross employs an LFO waveform that is ideally suited to slow sweeps, where the P90 has an LFO that is a good choice for faster sweeps, and not entirely unpalatable for slower ones.  The Ross provides options for implementing other filter-stage types which the P90 cannot.  The P90 makes it much easier to implement variable sweep width.  The Ross makes it easier to build in some gain to the output stage and have variable output level.  The P90 requires that the JFETs be reasonably well-matched where no matching of any sort is needed for the Ross.  I have absolutely no idea which one has the lowest battery drain.

I have several of each, and they are both pretty decent.  I have no favourite.

[petemoore]

  None better !