Phase 90 Schematic (original, no mods)? Any available?

[wampcat1]

Hey all - does anyone know of a phase90 schem available (not the geofex version or tonepad version), but a version of the stock circuit? Tried a search and didn't find one.

Thanks,
Brian

[vanhansen]

I've looked myself and can't find it either.  I'd like one myself.

[Khas Evets]

Isn't the Phase 180 at Geo just an upgraded Phase 90? There's also one at tonepad.

[TheBigMan]

Isn't the Phase 180 at Geo just an upgraded Phase 90? There's also one at tonepad.

That's what I thought: that RG's schem just showed a Phase 90 but with the phase stage isolated so you could build as many as you like.

[stompbox steve]

you might want to check out my post called "Phase 90 signal killed with bypass mod".  I have a picture of my board for true bypass.  Please note that the effect out needs to be moved to the other side of the resistor.  

watch out for the trace above the switch.  I cut it and needed to add a jumper.  here is a page for mods for the block to script sound
good luck

http://home.earthlink.net/~ehansen3/diy/phase90.htm

[Fret Wire]

here is a page for mods for the block to script sound
good luck
http://home.earthlink.net/~ehansen3/diy/phase90.htm

Those mods are actually for the Dunlop reissue Phase 90 with the board mounted pots, jacks, and switch. The components on the MXR Block-logo 90 aren't located in the same place as the reissues. The R28 mod is not a true script mod, but gets you close to the original sound. Removing C11 and C12 will lessen the intensity of the effect, more like a "phase 70" as I call it.