Phase 90

[timrand]

I have a newish Phase 90 I have removed R28.
What is the bypass like on these pedals ?

[Fret Wire]

It's not true bypass. Were you happy with the results, or did it still have too much distortion and boost in the effected signal?

[timrand]

The effect is defantaly more subtle really smooth. However I still didn't mind the resistor in the circut I reckon replacing it wioth a 10K might be a good option. I haven't seen the schematic so I am not sure where it sits in the circut.

Is  the true bypass any good in these units ?

[Fret Wire]

R28 is a 24k resistor. Here's the link to the schematic on tonepad. There are slight differences overall in the circuit with switching, but the feedback resistor is the same. It's marked 22k in red:

http://www.tonepad.com/getFile.asp?id=42

Here's your board:

http://acapella.harmony-central.com/forums/attachment.php?s=&postid=6750568

Pulling r28 diminishes the regeneration and cuts the strong midrange boost the pedal has. Usually, the pedal still has quite a volume boost when you kick it in.  You can also remove c12(680pf) and c11(.01mf) (pre & de-emphasis). This will mellow the effect further.  Replacing r7 (150k) with 125-130k will result in unity gain, instead of the volume boost it presently has. R7 is located right above c12 on the reissue. You can do the r28, and the cap mods separately, or together. The r7 should only be done in conjunction with the cap mods. All three together make a nice effect. For others, r28 is enough.