Blues Jr "Twin"

Discussion in 'Shock Brother's DIY Amps' started by jsnwhite619, Sep 17, 2019.

  1. jsnwhite619

    jsnwhite619 Friend of Leo's

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    First of all, kudos to the guys who really take the time to photo-document their entire builds each step of the way. I don't see how you keep up. I kind of just take pictures in stages after they are complete, not while I'm doing it.

    A local guy asked if I could build a 2x12" tweed cab for his Blues Jr. And that sounded like a good idea to me. He said he has two C-Rex speakers laying around, so that's what is going in it. Also, a new Allen Blues Jr upgrade with 4/8 ohm taps.

    So, here is a Tweed Blues Jr/Twin cab in the works. 27" wide x 18-1/2" high x 10-3/8 deep at the bottom with a 5 degree slant. 3/8" baltic birch baffle. I was hesitant to use 3/8" instead of 1/2". but I may just run an extra brace strip glued straight up the middle between the speakers. She's a biggun! That's my old Pro Jr cabinet for reference.

    I've got to add one more personal victory. I traced out the size of the baffle just by laying the cab down on the plywood. I drew the center lines both ways, played with some speaker placement, but I wanted to get as much wood left on the edges and center as I could for strength. I finally took the 1-1/2" side of my square and marked it on each edge and straight down the middle. I figured I could do the "straight sided circles" like some of the old cabs did. When I put my cutout template on there, I couldn't believe it. The arc of the circle hit hit all four straight lines perfectly. I ended up dropping them down an inch or two to lower the center of gravity in the end. But, I couldn't have planned that part any better.

    IMG_20190916_213051844_HDR.jpg

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    IMG_20190917_150141601_HDR.jpg

    IMG_20190917_173014109_HDR.jpg
     
  2. jsnwhite619

    jsnwhite619 Friend of Leo's

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    And since I forgot in the earlier post, and I didn't take pictures.... Ever since I restored that '59 Deluxe last year, I've take the easy Fender route on the baffle cleats. Cut 3/8" plywood strips for top & bottom, glue them on with a few brads shot in to hold it in place then clamp them down. Then either pine or ply filler strips on the front sides don the same way. I never used to do it, but that is how Fender did it, there's no bearing on sound or strength difference, and it's a hell of a lot easier and faster than notching into the cab for those top & bottom cleats. Just be sure you shoot your brads far enough in to avoid the roundover router bit, and give them a few taps to set them to be even safer. Then wood filler over the holes. I built several without doing it that way, but after realizing how Fender did it on that original cabinet, I started taking their route.

    And one more shot to show off my oak dowels set into the wings.

    IMG_20190917_214216836_HDR.jpg
     
  3. reckless toboggan

    reckless toboggan TDPRI Member

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    Subscribed and eagerly waiting to hear what the final build sounds like.
     
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  4. sds1

    sds1 Tele-Afflicted

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    Oh I can tell you right now it's gonna sound 1000% better than that boxy little MDF cab with the garbage stock speaker. Reckon the new iron won't hurt either.
     
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  5. KeepItSimpleTele

    KeepItSimpleTele TDPRI Member

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    This is beautiful work. I can only imagine how much more bottom end this Jr will have now with the Cannabis Rex x2, the bigger cabinet....AND the transformer to firm up the bass from the amp. Huge!
     
  6. 7171551

    7171551 Tele-Afflicted

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    It'd be fun to compare it with this...
    P1020362.JPG P1020363.JPG P1020364.JPG
     
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  7. JuneauMike

    JuneauMike Friend of Leo's

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    I did something very similar to my Blues Jr, and the larger cabinet was the perfect mod to make the amp sound like something more substantial. Don't be surprised if you suddenly realize that the stock speakers sound totally different in the larger cabinet.
     
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  8. jsnwhite619

    jsnwhite619 Friend of Leo's

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    I tell people all the time that the Pro Jr & Blues Jr biggest drawbacks are the cabinets & speaker. The Pro Jr can really transform into a new beast. He already has the 2 C-Rex's from another cabinet, so those are a done deal.
     
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  9. jsnwhite619

    jsnwhite619 Friend of Leo's

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    Debating whether I feel like getting the bottom wrap on tonight. 50/50 at this point, but the corners are done, so that's the bulk of the work.[​IMG]

    Sent from my moto g(6) using Tapatalk
     
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  10. jsnwhite619

    jsnwhite619 Friend of Leo's

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    Latest update. The weather here finally changed to fall mode, and it was maybe 35% humidity and 80 degrees. The glue was almost drying too fast! Those big panels are tough to get lined up once the glue is on there. I realized today that I don't have enough 1/4" plywood on hand, so I ordered some more that shouldn't take too long to arrive. So, not much to do until then.

    Picture is on my phone, and I'll add it in the next comment.
     
  11. jsnwhite619

    jsnwhite619 Friend of Leo's

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    Here it is.[​IMG]

    Sent from my moto g(6) using Tapatalk
     
  12. Fluddman

    Fluddman Tele-Meister

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    Great work! I love doing this type of work - just wish I had the time to do more of it. So for time being I'm enjoying watching yours.

    Thanks for taking the time to take and share the pictures.

    Cheers
     
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  13. stefanhotrod

    stefanhotrod Tele-Meister

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    Great work!
     
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  14. Bristlehound

    Bristlehound Friend of Leo's

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    A thing of beauty!
     
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  15. Commodore 64

    Commodore 64 Friend of Leo's

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    I'd hit it.
     
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  16. No457 Snowy

    No457 Snowy Tele-Meister

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    Beautiful work. That amp is going to sound huge in that cab with the 2 Crex speakers.
     
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  17. reckless toboggan

    reckless toboggan TDPRI Member

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    Seriously can't wait to hear it.
     
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  18. boredguy6060

    boredguy6060 Friend of Leo's

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    Post #6 is the best looking cabinet I’ve ever seen anywhere.
    SacDave makes a beautiful non traditional cabinet that I really like, but in the traditional category, the tolex and grille cloth design is outstanding.
    Bravo on great design and craftsmanship.
     
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