MXR Phase 90

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MXR Phase 90

Postby David B » Sun Dec 27, 2015 11:28 pm

Has anyone repaired one of the older script logo units? I have one that stopped phasing :( looking for tips to get it working.

Thanks,

David
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Re: MXR Phase 90

Postby Brian Wallace » Mon Dec 28, 2015 9:05 pm

Haven't fixed one yet but it can't be too hard. :)
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: MXR Phase 90

Postby David B » Tue Dec 29, 2015 1:30 pm

Just started poking around in there but haven't found anything obvious yet.
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Re: MXR Phase 90

Postby David B » Sun Jan 24, 2016 1:47 pm

Forgot to report back, was an easy fix, just needed a tweak of the trimpot.
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Re: MXR Phase 90

Postby Brian Wallace » Sun Jan 24, 2016 9:08 pm

Awesome. :)
Remember....You can fix it with a little extra energy and a positive attitude. ;)
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Re: MXR Phase 90

Postby David B » Sun Jan 24, 2016 9:48 pm

Sounds great too, wouldn't mind one of these on my board :D
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Re: MXR Phase 90

Postby dai h. » Mon Jan 25, 2016 6:24 pm

so the trim pot contact oxidized (and was restored through movement)?

the closest to that I've got is a later JD era converted to earlier circuit and one tant cap changed to slow the oscillator (back when I was doing ""b****n s***d chasing" :lol: ). However, I don't have too much of a clue how the circuit works.
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Re: MXR Phase 90

Postby David B » Mon Jan 25, 2016 8:24 pm

Ya know that could very well be, initially I thought someone might have accidentally bumped the pot when they removed the deteriorating foam crap. happens again might be good to replace the pot.

some P90 stuff

http://www.electrosmash.com/mxr-phase90
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Re: MXR Phase 90

Postby dai h. » Thu Jan 28, 2016 7:20 pm

thanks for the link. The linked interview with someone who worked at MXR early on (proprietor of Electroplex amps) is interesting also (he is apparently responsible for the later version circuit).
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