View source for MXR Phase 90

[[File:MXR M-101 Phase 90 modified.jpg|thumb|right|MXR M-101 Phase 90]]
[[File:MXR EVH90 Phase 90.jpg|thumb|right|EVH90 Phase 90]]
The '''MXR Phase 90''' is a [[phaser (effect)|phaser]] [[effects pedal]] introduced in 1972 by [[MXR]].
==History==
The Phase 90 was the first pedal sold by MXR and helped launch the company in 1974.<ref>{{cite book|last=Hunter|first=Dave|title=Guitar effects pedals: the practical handbook|year=2004|publisher=Hal Leonard|isbn=978-0-87930-806-3|pages=81|url=https://books.google.com/books?id=7DjYrk7Vap4C&pg=PA81}}</ref> The original model had a simple orange enclosure with a script style MXR logo. In 1977 MXR changed its logo to a block style.  There was a transitional period in which some Phase 90s with script logos had box logo circuits, and vice versa. Production ceased when MXR went bankrupt in 1984.<ref>Hughes, Tom (2004). ''Analog Man's Guide to Vintage Effects'', p. 75. For Musicians Only Publishing. {{ISBN|0-9759209-0-1}}.</ref>
When [[Jim Dunlop]] bought the MXR brand, production resumed. The Dunlop models have an LED to indicate the effect is engaged, and an optional [[alternating current|AC]] power supply. There are several styles, including the standard block logo version, a reproduction of the script logo version, and an [[Eddie Van Halen]] signature model.<ref>{{cite web|title=MXR EVH Phase 90|url=http://www.jimdunlop.com/index.php?page=products/pip&id=259&pmh=products/p_and_e|publisher=Jim Dunlop|accessdate=13 September 2010}}</ref> Van Halen first heard  [[Robin Trower]] use the pedal in the mid-1970s, and used it on songs such as "[[Eruption (instrumental)|Eruption]]", "[[Atomic Punk (Van Halen song)|Atomic Punk]]", "[[Ain't Talkin' 'bout Love]]", "[[Everybody Wants Some!! (song)|Everybody Wants Some!!]]", and "[[Drop Dead Legs]]".<ref>{{cite web |title=Eddie Van Halen on How He Created His Signature Sound Using MXR's Phase 90 and Flanger Pedals|url= https://www.guitarworld.com/gear/eddie-van-halen-how-he-created-his-signature-sound-using-mxrs-phase-90-and-flanger-pedals |publisher=Guitar World|accessdate=30 June 2020}}</ref> The 1974 Hand Wired Phase 90 is a recreation of an original 1974 pedal using [[new old stock]] (NOS) electronic components.
==Description==
The Phase 90 has an orange enclosure with a single control knob:
* ''Speed'' - varies the speed of the phasing effect.
The earliest "block" variants differ from the "script" variants in that they have a more pronounced sound (caused by the addition of a 24 kΩ feedback resistor) and the maximum speed is slightly higher (caused by the replacement of a 10 kΩ resistor in the effect's [[Low-frequency oscillation|low-frequency oscillator]] with a 4.7 kΩ one); some later vintage units also have [[Emphasis (telecommunications)|emphasis and de-emphasis]] circuits.<ref name="Hansen2007">{{cite web |last1=Hansen |first1=Erik |date=2007 |title=MXR Phase 90 Differences |url=http://www.erikhansen.net/?page_id=32 |type=self-published source |website=Erik's Corner |archive-url=https://web.archive.org/web/20071201084116/http://www.erikhansen.net/?page_id=32 |archive-date={{date |2007-12-01 |mdy}} |access-date={{date |2022-07-17 |mdy}} |url-status=unfit }}</ref>{{Better source needed |date=July 2022}}
==References==
{{Reflist}}{{Commons}}
[[Category:Effects units]]
[[Category:MXR]]
[[Category:Products introduced in 1972]]