The old ones can be recognized on the tropical fish and that the wire holes are symmetrical in the middle of the pcb-edge. JFET matching fixture: A circuit which can match JFETs for Vgs at a 'typical' current, which produces good results for JFET-type phasers like the Phase 90.
Phase 90/180 schematic: The MXR Phase 90, plus extension to eight stages. the CSP101 was not hand wired like th 74 is. The new EVH MXR Phase 90 adds a Script switch, which logically confirms what Ive always asserted: despite all. What you are talking about was the CSP101 script Phase 90 reissue which came out before I did the 74 script reissue. Eddie Van Halens Rig and Tone Techniques.
The feedback resistor (intensity) of 15k seems to have been changed in 1978, maybe earlier.Īlltogether it appears that the - not real significant -change has occured earlier in the script era and not together with the script/block change. An update/extension of the Phase 90 with extra stages and controls for the experimenter. The (CSP026) 74 Script Phase 90 reissue has never been made with an LED or power jack from the factory. I don´t believe that the difference between 22k and 20k will have a big influence, since this can also result from capacitor tolerances (10% - 20 %). The only difference in the audio section are the tropical fish caps and the 22k resistors instead of the white film and 20k resistors.
So after a short analysis I came to the following results: