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Mercury Magnetic JTM45-RI-P wonít fit.... Help.

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  • Mercury Magnetic JTM45-RI-P wonít fit.... Help.

    Hello everyone, got a situation here. I ordered a chassis for a jt45 build. I was going to use my Mercury Magnetics Axiom jtm45-ri-p Power Transformer (center to center 2-1/2 x 3-1/8Ē) but itís too small. The holes on the chassis are 2-78 by 3-5/8 which I believe is the metro-amp standard chassis size. So my questions are: what gives?? Is this PT special? Can anyone recommend a chassis that would fit or do I have to do a custom chassis order for this PT? Thanks.

  • #2
    Can you just drill new holes? The transformer is upright or the laydown style?

    https://reverb.com/item/13212544-mar...w-iec-knockout

    this person can make a custom chassis for you but not sure if you need it all predrilled and pre cut

    Comment


    • #3
      re-issue transformers are not always the same size as the originals. I suppose the metro is using the original size PT.
      "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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      • #4
        But, whatever else Mercury does, they usually clone accurate for mounting from what I've read. So the RI must use a different size transformer than an original, which is likely what the Metro chassis is cut for.

        It's a clone, not an original. Even boutiquey type amps often have odd cutouts and plugs for correction. Drill new holes or, if necessary, add a mounting plate or something. I don't think it's great shakes unless you're OCD over it.?.
        "Take two placebos, works twice as well." Enzo

        "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

        "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

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        • #5
          Are the dimensions cut out size or location of the holes?. Anyway If your xformer is smaller, see if you can make it work using Fender Washers.

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          • #6
            got any photos you can post of the transformer and chassis?
            The only good solid state amp is a dead solid state amp. Unless it sounds really good, then its OK.

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            • #7
              Some info anyway. Didn't think they had these all online.

              http://mercurymagnetics.com/images/p...JTM45-RI-P.pdf
              The only good solid state amp is a dead solid state amp. Unless it sounds really good, then its OK.

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              • #8
                Thanks to everyone. I will post some pictures when I get to my desktop computer. iOS forum doesnít have an option to upload images. Transformer is a tad too small, so drilling new holes in not an option. Iíll probably re-use this chassis for a proper sized PT. In the meantime Iím going to call MM to ask what they where thinking when they made this particular model.

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                • #9
                  Originally posted by cluster View Post
                  In the meantime I’m going to call MM to ask what they where thinking when they made this particular model.
                  It is meant to fit the re-issue. I don't think the vintage size one will fit the re-ish.
                  "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

                  Comment


                  • #10
                    This^^^^^^^^^^^^^^^^

                    Why make enemies when you may be in the wrong.?.
                    "Take two placebos, works twice as well." Enzo

                    "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                    "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

                    Comment


                    • #11
                      I'm finding it hard to believe that you couldn't make it work. Maybe some drilling, maybe a trip to the hardware store for washers, etc. Looking at your numbers in the first post and the datasheet Mike so graciously posted, the transformer should cover the holes in the chassis. Nobody would see any "adapting" you'd have to do internally in order to securely mount it.
                      "Yeah, well, you know, that's just, like, your opinion, man."

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                      • #12
                        here are my pictures...
                        Attached Files

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                        • #13
                          Round into the corners of the cutout and use an unsecured adapter plate inside. Sort of sandwich the chassis between the transformer and the plate. You'll need to make the plate, of course. Shouldn't be too hard if you have the tools.
                          "Take two placebos, works twice as well." Enzo

                          "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                          "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

                          Comment


                          • #14
                            This is what I'm thinking.

                            Attached Files
                            "Take two placebos, works twice as well." Enzo

                            "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

                            "Being born on third base and thinking that you must have hit a triple is pure delusion!" Steve A

                            Comment


                            • #15
                              I like Chuck H's idea!
                              Usually, I'm going the other way, and draw the size hole I want on the chassis, and get a friend with a mill to open it up for me. I'm currently building a Bassman 10, using the iron from a re-issue Twin!

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