New MXR Custom Shop Phase 90 Script IS true bypass!

Discussion in 'Effects, Pedals, Strings & Things' started by Michael_V, Feb 9, 2012.

  1. Michael_V

    Michael_V Supporting Member

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    I recently sold an expensive boutique phaser and got one of these (for considerably less $) and am very pleased with it! Emailed MXR customer support because it sure seemed to be true bypass (even transmits a signal when unpowered) and sure enough the newest batch (revision C) is true bypass. Pretty cool! This is a great phaser for around $100.
     
  2. ZeroChan

    ZeroChan Member

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    What?! But I wanted to tonesuck of the their 'Hardwire' bypass..haha. CSB.

    Just FYI even the 'Hardwire' bypass that aren't really true-bypass transmits signal unpassed, too.
     
  3. drbob1

    drbob1 Silver Supporting Member

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    Most of the original MXR/DOD etc effects used a bypass that disconnected either the input or the output of the effects block, but not both. That results in a signal that can be loaded down by the stuff that's still in circuit. It DOES pass signal with no power.

    Boss uses a buffered bypass, doesn't pass signal without power.

    Ibanez uses FET switching, which also doesn't pass signal without power.

    Unfortunately, the only way I'm certain if a pedal is true bypass is looking at a TPDT switch wired so both the input and output of the active circuit is out of the loop when it's switched. And I DON'T believe marketing because "true bypass" means different things in Corporate-Speak...
     
  4. Michael_V

    Michael_V Supporting Member

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    Corporate caution duly noted. Good point. Looks like I will have to open mine up tonight and have a look see inside...
     
  5. blackba

    blackba Supporting Member

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    Let us know what you find. The bypass was one of the reasons I sold my modified MXR block reissue phase 90 and my EVH phase 90. I currently have a whirlwind orange box. :)
     
  6. jcmark611

    jcmark611 Member

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    Not to hijack, but is there any difference in the version with LED and the one without?
     
  7. Strat58

    Strat58 Member

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    Hi I have a EVH Phase 90 wich is made TB :) great phaser
    Peace Strat58
     
  8. Michael_V

    Michael_V Supporting Member

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    I opened it up but not sure what to look for. The TPDT switch is under the CB. I do have revision C, and there is no discernable tone suck. Any tips?
     
  9. analogmike

    analogmike Gold Supporting Member

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    Can you take a picture of the switch and post it?
     
  10. ronin4hire

    ronin4hire Member

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    I think the '75 reissue doesn't have a power jack? Also, Better parts from what I hear.
     
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  11. gold_soundz

    gold_soundz Member

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    ^

    The led version is the script setting on the evh pedal, i.e., a modded 'normal' mxr phase 90. The 74 reissue is a direct copy of an orignial non-Dunlop mxr script phase 90. This looks quite different inside to any of the other Dunlop phase 90s.

    For what it's worth I think the 74 reissue is by far the best of the range. I also really like the phase 45 reissue.
     
  12. blackba

    blackba Supporting Member

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    So are you saying that you modified the EVH phase 90 to be true bypass?
     
  13. Michael_V

    Michael_V Supporting Member

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    Sure thing, Mike. Away this weekend. Will post Monday night!
     
  14. dirtytony

    dirtytony Member

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    Im curious too.. I got one when they come out and I got rid of my '75 (pristine conditions still had opriginal box etc) as they sounded 100% same but as the original mine isnt true bypass I hear clearly a treble loss when not engaged using a tb looper
     
  15. Strat58

    Strat58 Member

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    Hi I didn't do it myself but a builder in Amsterdam actualy made it TB. I bought it secound hand on the net and it is TB.
    Peace Strat58
     
  16. Michael_V

    Michael_V Supporting Member

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    I emailed MXR tech support and asked if the CS phase 90 was *really* true bypass and got this response:

    "Rev. C is definitely true bypass. The CSP101SL's that have the red PC Boards
    are true bypass, the earlier green ones are not."
     
  17. analogmike

    analogmike Gold Supporting Member

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    CSP101SL is not the hand wired custom shop pedal, totally different than the CSP-026.
     
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  18. succor

    succor Member

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    I don't think the OP made any reference to hand wired, though.
     
  19. Michael_V

    Michael_V Supporting Member

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    Here's the best shot I could get of the inside where the switch is:

    [​IMG]
     
  20. blackba

    blackba Supporting Member

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