Fender Super Tweed Build

Discussion in 'The Squawk Box' started by Cjsinla, Sep 23, 2017.

  1. Leña_Costoso

    Leña_Costoso Senior Member

    Messages:
    174
    Likes Received:
    140
    Joined:
    Aug 28, 2017
    Sweet! I'll be in the same spot tonight waiting on the filter caps. Then I'll start getting the sockets and controls attached mechanically.

    The question I have is are you going to follow the drawing or why are the power supply Mains in a more safe manner? That is to say if you make the fuse the first thing seen by the black wire coming in you don't have to worry about the death cap on the ground switch. If the cat blows it'll blow the fuse.
     
  2. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Yeah, the Weber diagram has the power hitting the fuse first, right at the start.
     
  3. Leña_Costoso

    Leña_Costoso Senior Member

    Messages:
    174
    Likes Received:
    140
    Joined:
    Aug 28, 2017
    Excellent! The Mojo diagram shows nada for the ground switch, and the schemo shows the fuse on the neutral. Go figure! I think we got the skilz-to-pay-the-bilz to fix that one though.
     
  4. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    The ground switch is not used on mine either.

    IMG_0587.PNG
     
  5. sonar

    sonar Senior Member

    Messages:
    2,776
    Likes Received:
    1,826
    Joined:
    Sep 10, 2008
    Old post, but had to comment.

    My favorite part of a build is populating the board. Makes me want to do another project...

    like I need another amp!
     
    Splattle101 and Cjsinla like this.
  6. Caoimhin

    Caoimhin Senior Member

    Messages:
    8,166
    Likes Received:
    8,102
    Joined:
    Oct 12, 2009
    There's something beautiful about hand wired amps. I pulled my Friedman apart so I can took a look on the inside. It's like an artist looking at a painting or a gearhead looking under the hood of an old muscle car.
     
    RAG7890 likes this.
  7. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Yup. I did some more tinkering today, pulled out the Weber caps and put in the Mojo dijons. Weber is also sending me the 16uf electrolytic caps and I'll finish the board when they get here.

    IMG_1449.JPG
     
  8. Soul Tramp

    Soul Tramp Speaker Snob MLP Vendor V.I.P. Member

    Messages:
    5,596
    Likes Received:
    11,987
    Joined:
    Jul 19, 2012
    It's a good idea to elevate the resistors off the eyelet board. Having an air-gap around the resistor helps it shed heat. As resistors heat up they induce noise into the signal path. This is one of the two reason CC resistors are a poor choice.

    Also, be sure none of the resistors are touching any of the caps. Resistors can get got enough to damage caps.
     
  9. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Good info. I'll check the resistors for air gaps.
     
  10. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Finally got the right filter caps from Weber. Finished wiring up the board and got the pots and input jacks ready to go. Next thing will be to wire the PT to all the appropriate connections.

    IMG_0588.JPG

    IMG_0589.JPG
     
  11. eslover

    eslover Senior Member

    Messages:
    164
    Likes Received:
    97
    Joined:
    Sep 1, 2009
    Looks really nice do far.

    1. Does the Weber chassis have holes for stand-offs already drilled? or will the main circuit board be floating?

    2. Did you decide to go with the unmodified fixed bias circuit or are you making adjustable?

    Fred
     
  12. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    No stand-offs. It's a fiber board with eyelets. There's a second blank fiberboard that sits below the main one. They did drill holes in the boards and chassis for sheet metal screws to hold the boards down. They lay flat on the chassis and the second board is the insulator for the main board. I'm building it to spec more or less, the bias will not have an adjustment.
     
  13. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Decided to drop the boards in, make most of the connections and do the heaters last. If you look closely you will see one of the screws at the top left that attaches the board to the case. I believe that screw may be touching the back of the filter cap lead. But, if I'm correct, that lead goes to ground anyway and should not be a problem. Am I wrong on this?

    IMG_1452.JPG
     
  14. eslover

    eslover Senior Member

    Messages:
    164
    Likes Received:
    97
    Joined:
    Sep 1, 2009
    My eyesight must be going because I can't see the screw you are referencing from the pic. Is it possible for you to do a continuity test with a multimeter?
     
  15. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    This one here. That cap goes straight to ground, that's the white wire connected at the top of the cap.

    IMG_1453.PNG
     
  16. Splattle101

    Splattle101 V.I.P. Member

    Messages:
    8,593
    Likes Received:
    4,040
    Joined:
    May 30, 2008
    Yes, it's a problem.

    As a matter of principle, there should be no connections anywhere in that device that you have not planned and intentionally made. So you should fix it. Lift or move the lead, put some shrink on it, move the screw, whatever. Don't leave it.

    Even if we assume for the sake of argument that this contact won't cause a problem (and that's not an assumption I'd make!), it will cause issues when the amp vibrates.

    So I would definitely fix it.
     
    Soul Tramp likes this.
  17. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Ok, I'll fix it.
     
  18. eslover

    eslover Senior Member

    Messages:
    164
    Likes Received:
    97
    Joined:
    Sep 1, 2009
    Yes, please follow what Splattle101 said.

    I thought that screw was a glob of solder for the filter cap...eek.
     
  19. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Ok, fixed the cap problem and wired up the pots.

    FullSizeRender.jpg
     
  20. Cjsinla

    Cjsinla Premium Member

    Messages:
    2,504
    Likes Received:
    1,396
    Joined:
    Jul 7, 2014
    Got another problem. The pre-amp sockets have a metal terminal in the middle, what should I do?

    IMG_1456.JPG
     

Share This Page