First Cab Build for my 5F2A

Discussion in 'Shock Brother's DIY Amps' started by screefer, Aug 23, 2020.

  1. screefer

    screefer Tele-Holic Silver Supporter

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    As promised, here is my first attempt cab build for my new amp posted in this thread... https://www.tdpri.com/threads/rookie-5f2a-attempt.1030951/

    It is built with western red cedar with a yellow cedar handle and top fascia. I cut the wood on my Mighty-Mite band mill. I made a jig for my Dewalt portable table saw and purchased a set of Oshlun 6" dado blades thinking I would do the traditional 3/4" finger joints. When I went to install the blades I found that the mandrel/shaft on the saw would only take 3/8" (first rookie mistake).
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    So now that my joints are 3/8" and there are more of them I decided to use PL Premium to glue them up. PL has a 30 minute open time and, for a first timer, I thought that would be prudent. A tad messy but it came together in my clamping rig (employing wedges) as I am short on bar clamps. I didn't realize until I had glued up that I had drilled the two inch holes for the chassis cut out on the wrong side!!(second rookie mistake).
    I decided to continue as I figured that this isn't going to be the first one. Might as well learn on this one.
    The bogus holes will be for 'ventilation' and I'll add them to the other side for symmetry :confused:.
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    I left the joints long but too long. Just needs to be a tad long. 50 grit on random orbital cleaned them up but next time.....

    So here it is, clams and all. I cut out the chassis hole with a jig saw, free hand. (third rookie mistake)
    The finger joints came out OK so why not a jig for everything....lesson learned.
    Red Cedar is softer than the 'Niner defense and there was some tear out on the joints if you scroll in.. I used a 1/2" round over but went too fast ( fourth...you guessed it). Not the greatest wood for a cab but this will never leave the house. The baffle is one piece edge grain red cedar backed by 1/4" fir plywood. The grill cloth is a $2.50 textilene place mat sandwiched between the two. There is a 1 1/8" taper/slant on the front but the pix don't show that. I gave it three coats of linseed oil and called it a day...
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    The result is that I learned tons by doing this and the amp itself. I am truly "addicted" and am planning, and already have, the goods for two more builds.

    P.S. for all of you who are thinking of a project like this...just do it!
     
  2. Paul-T

    Paul-T Tele-Meister

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    lovely job, well done.

    I've embarked on a similar journey, made my first 5F2a cabinet, and am just about to cover its slightly-better successor. Although my second isn't as neat as your first!
     
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  3. Nickfl

    Nickfl Friend of Leo's

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    I'd say that's very good for a first cabinet build! Those unintended ventilation holes in the side are the only real noticeable mistake and you even managed to make them look intentional even if they don't actually make much sense when you think about it, but I think the average non amp builder would think they were a feature not a mistake.

    My only criticism is that you have your rear panel on upside down...
     
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  4. screefer

    screefer Tele-Holic Silver Supporter

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    Thanks Nick,
    The upside down panel was my fifth rookie mistake but I thought that having the shielded slot/holes towards the top would aid in ventilation.

    Could you educate me as to...
    one- why ventilation isn't necessary?
    two- what is the function of the back panel regarding upside down or not?

    Google hates me and I need to learn.

    Regarding the 'only mistake', the tear out and wonky chassis cut out are more noticeable in person than in a photo but will be eliminated in next build...
    Thanks again
     
  5. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    We want the vent around the tubes so there is airflow there :D
     
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  6. schmee

    schmee Doctor of Teleocity Silver Supporter

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    That is sweet. Cedar is one of my favorite woods.
     
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  7. dunehunter

    dunehunter Tele-Holic Double Platinum Supporter

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    First off nice!

    Addendum: as cedar is considered a "tone wood", I'd be curious to know after it's all complete whether or not you think that the choice of wood "colors" the speaker output. Also be curious as to how the "ports" will affect the tone but don't think you'll be able to quantify that at all.
     
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  8. screefer

    screefer Tele-Holic Silver Supporter

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    Thanks!
    I'm not really qualified to make that judgement as this is the first time I have played a tweed circuit.
    Sounds great to me though!

    The Cedar is so soft that it would not survive lookin' purty for long.
    I haven't gone to 'cover school' yet but am working up the courage.
     
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  9. jimbo735

    jimbo735 Tele-Afflicted

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    Take a Bow Thats very good!
     
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  10. screefer

    screefer Tele-Holic Silver Supporter

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    I've harnessed convection to create airflow. Tubes get hot, heat rises out the top slots, eh?
    ....think of the bottom of the panel as the cathode and the slots as the plate....:eek:
    Blasphemy, I know:) but I will be back with a better effort.
    Thanks
     
  11. David Barnett

    David Barnett Doctor of Teleocity

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    That turned out pretty darned nifty.
     
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  12. RollingBender

    RollingBender Tele-Afflicted

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    I thought the holes on the side were done on purpose until I read the text. Nice save.
     
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  13. screefer

    screefer Tele-Holic Silver Supporter

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    Thanks...
    live and LEARN!
     
  14. Treehouse

    Treehouse Tele-Meister

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    Wowzers!
     
  15. Tele Slacker

    Tele Slacker Tele-Meister Silver Supporter

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    Hey @screefer , sorry if I overlooked, but do have specifics on the jig?


    Cab looks great!
     
  16. screefer

    screefer Tele-Holic Silver Supporter

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