Origin Mods!

Discussion in 'Marshall Amps' started by CyrusTheFabulous, Jul 9, 2018.

  1. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

    Joined:
    Jul 2, 2018
    Messages:
    9,144
    Likes Received:
    14,122
    Location:
    Moreno Valley CA
    Yes there is a way, if you have your clips on Utube channel? hit share copy, come back to the thread you want to post in, hit the little thing that looks like a chain link, says url hold till you can paste, insert , post!! sorry for the non tech jargon, but that’s how I have been doing it. Cheers
     
    MarshallDog and tce63 like this.
  2. fancychords

    fancychords Member

    Joined:
    Nov 30, 2011
    Messages:
    47
    Likes Received:
    54
    Hope this helps. I have the 50c. I love it I run it without the boost on. I use gain changer for a mild kick and an OCD. I find it works very well like this.
     
    Mitchell Pearrow and tce63 like this.
  3. MarshallDog

    MarshallDog Well-Known Member Premium Member

    Joined:
    Nov 28, 2010
    Messages:
    12,876
    Likes Received:
    12,607
    Location:
    Taintville
    I hit my 50C with either an OCD, Xotic RC Booster or Tube Screamer. It all sounds good with this amp IMO!
     
    Last edited: Jun 4, 2019
    steveb63, tce63 and Mitchell Pearrow like this.
  4. Dougie

    Dougie New Member

    Joined:
    Feb 18, 2009
    Messages:
    5
    Likes Received:
    7
    What would it involve to mod an Origin 50 to JTM spec with KT66? I bet this amp would sing in the JTM45/KT66 style!
     
  5. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

    Joined:
    Jul 2, 2018
    Messages:
    9,144
    Likes Received:
    14,122
    Location:
    Moreno Valley CA
    Not sure, I mostly just play, and mess with the tones I can coax out of it!
    Cheers Mitch
     
  6. Jason Fieldhouseespk

    Jason Fieldhouseespk Well-Known Member

    Joined:
    Apr 21, 2018
    Messages:
    296
    Likes Received:
    448
    Only just become aware of this thread everyone, sorry....

    Mods I'm working on are PPIMV, and a FX loop on off switch, to save using the pedal.
     
  7. ampmadscientist

    ampmadscientist Well-Known Member

    Joined:
    Jun 26, 2014
    Messages:
    15,552
    Likes Received:
    9,459
    Location:
    Start the reactor... Free Mars!
    I think you better get a schematic or draw one first before starting any mods.
     
    Jason Fieldhouseespk likes this.
  8. Jason Fieldhouseespk

    Jason Fieldhouseespk Well-Known Member

    Joined:
    Apr 21, 2018
    Messages:
    296
    Likes Received:
    448
    I will look into that too, I am pretty confident in the chain from the phase inverter to the transformer.... purely based on pictures of the board from online, I haven't turned it over yet, but I think I've got an idea of what we'll see when we do.
    My local tech is on holiday at the moment though, so could be a couple of weeks. :)
     
    tce63 and Mitchell Pearrow like this.
  9. Jason Fieldhouseespk

    Jason Fieldhouseespk Well-Known Member

    Joined:
    Apr 21, 2018
    Messages:
    296
    Likes Received:
    448
    Aye, well, Marshall have been asked about releasing the schems, not playing ball, so I am on with drawing one... just need my tech with me when we flip the board over and fill in the blanks...
     
    tce63 and Mitchell Pearrow like this.
  10. Jason Fieldhouseespk

    Jason Fieldhouseespk Well-Known Member

    Joined:
    Apr 21, 2018
    Messages:
    296
    Likes Received:
    448
    Calling all tech heads, my 20 head is the shop but the tevhnis on holiday, so I cant access it.
    I'm tracing the amp and drawing a schematic up for it, but with limited pictures to go on and not able to get the bpardnout and turn it over, it's slow going....

    I'd like to ask some help.

    Can any of you whom don't mind getting a screwdriver out and just opening it up, if you wouldn't mind, could you take some clearer, close up pictures of each of the valves and the components around them? I'm struggling to see the bands so I can work out what they each are, and confirm their correspondence to the circuit?

    Thank you to anyone who can help with any of this. You would then all be able to view a draft schematic of these amps...
     
  11. Sirena

    Sirena Member

    Joined:
    Oct 13, 2019
    Messages:
    22
    Likes Received:
    53
  12. Sirena

    Sirena Member

    Joined:
    Oct 13, 2019
    Messages:
    22
    Likes Received:
    53
    I hope that helps. Let me know if you'd like/need any more.
     
  13. rolijen

    rolijen Well-Known Member

    Joined:
    May 19, 2019
    Messages:
    101
    Likes Received:
    297
    35B2D7EA-4059-4C20-B7B1-8C97EF85F32C.jpeg

    First mod I’ve done: added a Plexi style indicator. Sounds better too. :)
     

    Attached Files:

  14. South Park

    South Park Well-Known Member

    Joined:
    Sep 14, 2019
    Messages:
    1,464
    Likes Received:
    1,093
    If you want want a old school amp build it. All tubes point to point board.all you are going to do screw up a good amp. If you want that Marshall sound you need study what makes it work. It is more than just a few parts .most amp mod lose the tone. And the amp is never the same
     
    Jason Fieldhouseespk likes this.
  15. Buzzard

    Buzzard Well-Known Member

    Joined:
    Sep 14, 2016
    Messages:
    959
    Likes Received:
    1,123
    They need the piping across the front.
     
    Jason Fieldhouseespk likes this.
  16. Jason Fieldhouseespk

    Jason Fieldhouseespk Well-Known Member

    Joined:
    Apr 21, 2018
    Messages:
    296
    Likes Received:
    448
    Well, I'm happy with the vintage old school circuit in this, I just want the master to be in a different place, when the master is up it will be out of the circuit, and I may even make that switchable pre/post PI.

    The circuit for the most part is similar in parts to a mid to late 60s JTM45/JMP50. Just with a pcb outlay...

    I've no issue with pcb, but theres reason pcb, or at least turret board is preferred by manufacturers over point to point, real point to point is a rats nest of of hazards!
     
  17. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

    Joined:
    Jul 2, 2018
    Messages:
    9,144
    Likes Received:
    14,122
    Location:
    Moreno Valley CA
    Nice post, welcome to the forum.
    Cheers Mitch
     
    Jason Fieldhouseespk likes this.
  18. Sirena

    Sirena Member

    Joined:
    Oct 13, 2019
    Messages:
    22
    Likes Received:
    53
    If you don't install anything that will damage other components then there's no harm in doing modifications. It's just a really good idea to know electronics theory before you begin modifying so that you either will know or will have a good idea of what a modification will do to the circuit. Do you know why a 220pf cap will do what it does? That's what you need to ask yourself and study if you don't. To give you a small hint. Capacitors act as frequency filters (HP, LP, BP, or BL).
     
    Mitchell Pearrow likes this.
  19. herbvis

    herbvis Active Member

    Joined:
    Jul 8, 2010
    Messages:
    152
    Likes Received:
    150
    I found that turning the master all the way up and keeping the gain at 2 or 3, Then using my ocd with the gain dimed and the tone low sounds really good at bedroom volumes.
    I do run the treble and mids and presence almost all the way down and bass around noon with tilt between 6 and 8.
     
    steveb63 and Mitchell Pearrow like this.
  20. rolijen

    rolijen Well-Known Member

    Joined:
    May 19, 2019
    Messages:
    101
    Likes Received:
    297
    That'll be the next thing I add.
     
    mad5066 and Mitchell Pearrow like this.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice