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Thread: Mojo JTM45 Schematic & Layout

  1. #1
    ToneOholic! big_teee's Avatar
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    Jun 2010
    Mid-South USA

    Mojo JTM45 Schematic & Layout

    Here's the Mojo So Called JTM45 Schematic and Layout.
    It's actually a version of the JTM45 but with major differences.
    It uses 32uf Can Caps instead of 16uf Turret board mounted Caps.
    It uses EL34s instead of KT66s.
    It uses a 3.4K Low Impedance Output Transformer for EL34s, instead of the 8k OT for KT66s.
    It does use a Rectifier tube for B+ Rectification instead of Diode Rectifiers common with EL34s.
    The Layout is Terribly hard to follow.
    The Input Preamp Circuit is the old JTM45, not the Split Cathode of the 1987 Circuit.
    These can be used to Trouble shoot Mojo Kit Builds.
    Good Luck,
    Attached Files Attached Files
    Last edited by big_teee; 09-17-2011 at 07:34 PM.
    Technicians Run the World, but Bankers, Lawyers, and Accountants, Take All The Credit!
    Keep Rockin! B_T

  2. #2
    Woodgrinder/Pickupwinder copperheadroads's Avatar
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    Jun 2009
    Iceburg Alley ,Newfoundland,CAN
    i want to build the 45 and i also want to do that mod you referred to
    & really i dont want to get into building amps for business
    pickups are simple

  3. #3
    Senior Member guitician's Avatar
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    Aug 2008
    It seems that those files are gone?

  4. #4
    Senior Member oc disorder's Avatar
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    Jul 2006
    Land Down Under
    guitician - Have a look at Big Teee's post over at Metro Amps forum.
    The files and others are still there. Forum ? View topic - Mojo JTM45 standby wiring.

    cross pollination ?

  5. #5
    g1 is offline
    don't forget the joker g1's Avatar
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    Feb 2010
    Canada, somewhere north of Fargo
    Might as well have them here too .
    Attached Files Attached Files
    Quote Originally Posted by sohosteve View Post
    I concluded that the only way the vintage 4558 will bring you closer to SRV is if you hold onto one while peeing into 100 Watt Marshall head running at full power...

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