MXR - Phase 90 (script, reissue)

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.

MXR - Phase 90 (script, reissue)

Postby analogguru » 30 Oct 2007, 07:45

MXR found the taste of the cake from the collectors money:

http://cgi.ebay.com/NEW-FROM-MXR-74-Vin ... dZViewItem

An rebuild of the script phase 90 - even the pcb-layout is the same.

analogguru
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Postby MoreCowbell » 30 Oct 2007, 15:30

Their "original-spec 1974 components" include metal film resistors. :D

Honestly, thats a very fair price, IMO...$129 for a well built reissue script P90..."Boutique" guys would ask a lot more for the same thing (possibly "less well built" than the MXR)
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Postby marshmellow » 30 Oct 2007, 17:09

And 6 single opamps?? :shock:
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Postby analogguru » 12 Nov 2007, 18:41

pf_fan wrote on Mon Nov 12, 2007 10:04 am:

Anyone interested in drawing a schematic of the new model of Phase 90? If so, here're some pics found at TGP:

Image Image Image Image Image
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Postby MrHuge » 13 Nov 2007, 04:15

Not sure why anyone would waste time trying to draw a schematic... It's a '74 Phase 90... I'm sure everyone has an official MXR vintage script Phase 90 schematic!
Hell... I'll attach my original 1977 schematic... if I only had 5 postings.... lol

Everything is as close to 1974 as RoHs will allow... If you find any discrepancies… blame RoHs. The component values are based on an original ’74 unit… Purchased new in 1974 by one of the Dunlop Engineers.
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Postby bajaman » 13 Nov 2007, 10:14

Hello MrHuge
We have a testing section on this forum - you can post 3 nonsense posts here, then you will be able to post schems and pics etc.
Nice to have you on the forum - enjoy :D
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Postby The Rotagilla » 13 Nov 2007, 13:24

That's great to hear but leaves me with two questions...

1) Why didn't Dunlop just do this with their first script Phase 90 reissue?
2) Did they fix the volume drop or copy that too?

So now we have the reissue script Phase 90, the reissue script Phase 90 with LED, the '74 Phase 90 and the EVH Phase 90 with script button.

:roll:
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Postby MrHuge » 13 Nov 2007, 17:36

The Rotagilla wrote:That's great to hear but leaves me with two questions...

1) Why didn't Dunlop just do this with their first script Phase 90 reissue?
2) Did they fix the volume drop or copy that too?

So now we have the reissue script Phase 90, the reissue script Phase 90 with LED, the '74 Phase 90 and the EVH Phase 90 with script button.

:roll:


1) I couldn't tell ya... I didn't work there when they made the first reissues.
2) I'm not sure what you mean? The '74 has no modifications to the circuit. So if there was a volume drop in it then... there still is.

The other two Script reissues will most likely be... "Phased" out...lol!
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Postby Angle Loss » 13 Nov 2007, 18:40

The Rotagilla wrote: Did they fix the volume drop or copy that too?

:roll:


Perhaps you are thinking of a small stone? I've never had a Phase 90 with a volume drop. I've had an original '74 bud box scripty, an original block logo, various reissues, and a homebuilt byoc and they have all boosted ever so slightly.

It looks like Dunlop might have got the idea finally :wink:
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Re: MXR - Phase 90 (script, reissue)

Postby Electric Warrior » 11 Dec 2009, 01:06

here's an early one on ebay: http://cgi.ebay.com/Vintage-1974-MXR-Ph ... 2003r18683
great pictures..
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Re: MXR - Phase 90 (script, reissue)

Postby borislavgajic » 11 Dec 2009, 09:42

here is PCB .......

viewtopic.php?f=38&t=5725&p=62548&hilit=script+phase+90#p62548

I've made 2 of them.....very subtle sounding

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Re: MXR - Phase 90 (script, reissue)

Postby xenrelic » 16 Sep 2011, 10:31

Here's a custom '74 Script style Phase 90 conversion of a current Dunlop issue block logo unit.

Image

Image

I attached a PDF layout that includes a wiring diagram, parts list and a scale PCB layout.

Cheers,
Xen
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Re: MXR - Phase 90 (script, reissue)

Postby bhill » 16 Sep 2011, 22:41

Having owned both (just sold the re-issue), I can tell you that they sound identical. I got the re-issue when my original 74 bud box 90 suffered a meltdown when the original foam disintegrated. Ordered the Dunlop 74, the $129 cost meant I paid $4 more than I paid for the original. :D After repairing the original, replaced a couple of burnt traces and the blocking diode, I then did an A-B with them, and there was no difference between the two. I think I am keeping the original more for the memories, rather than the sound, as I don't use either it or my Ibanez FL303 flanger on my current board. Been thinking of building one of Rick's casualty phasers so I have one in the chain, I kinda like the idea that my current board has only pedals that I've built, makes things easier to troubleshoot and I know I have all the components on hand for any repairs or mods.
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Re: MXR - Phase 90 (script, reissue)

Postby fakcior » 17 Sep 2011, 15:02

You've copied my layout, man :<
I sent it to you couple of days ago and even no "thank" from you.
Now you're receiving thanks for my work.
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Re: MXR - Phase 90 (script, reissue)

Postby xenrelic » 18 Sep 2011, 00:09

fakcior wrote:You've copied my layout, man :<
I sent it to you couple of days ago and even no "thank" from you.
Now you're receiving thanks for my work.


Hi fakcior,

This is not your layout, look closer and you will notice (although it is similar) it is a lot different. I used a bunch off of the net as reference to draw this one, including an original '74 unit and I allowed for bigger components to be used.

Besides, this layout belongs to the original designers of the MXR Phase 90, no one here has the right to claim it as belonging to them.

Regards.
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Re: MXR - Phase 90 (script, reissue)

Postby xenrelic » 09 Mar 2012, 23:06

I helped JD @ General Guitar Gadgets get these boards going.

They are slightly different with the option to have the flying 150k or a board mounted one.

You can get the '74 Phase 90 PCBs here:

http://www.generalguitargadgets.com/projects/23-phase-shifters/311-mxr-phase-90-script-logo

Image

-Xen
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Re: MXR - Phase 90 (script, reissue)

Postby sinner » 09 Mar 2012, 23:11

xenrelic wrote:I helped JD @ General Guitar Gadgets get these boards going.

They are slightly different with the option to have the flying 150k or a board mounted one.

You can get the '74 Phase 90 PCBs here:

http://www.generalguitargadgets.com/projects/23-phase-shifters/311-mxr-phase-90-script-logo

Image

-Xen


With what exactly you helped? Looks like stock vintage p90 layout on new pro production laminate :roll:
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Re: MXR - Phase 90 (script, reissue)

Postby rocklander » 10 Mar 2012, 04:03

I'm confused. what (if any) advantage is there to using 6X single opamps when room could be saved by using 3X dual? :scratch:
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Re: MXR - Phase 90 (script, reissue)

Postby early.memoirs » 10 Mar 2012, 12:33

rocklander wrote:I'm confused. what (if any) advantage is there to using 6X single opamps when room could be saved by using 3X dual? :scratch:


layout purpose ? ( they possibly had surplus parts on that single opamps, not sure where they used it though)
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Re: MXR - Phase 90 (script, reissue)

Postby rocklander » 10 Mar 2012, 21:43

thanks... so I guess my real question is, if I was to do a layout with 3X dual (or a single quad and a dual) there's no disadvantage from a sound perspective?
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