Starting my first amp build this week.

Discussion in 'DIY Amp Forum' started by Ironwolf, Sep 5, 2020.

  1. BlacknBlue

    BlacknBlue Strat-O-Master

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    Not sure if this will help with your turret board or not but when I installed all of the components on my eyelet board I labeled each row with a letter and put a piece of paper under it with the letters on it, helps to identify where each part goes easily.

    [​IMG]
     
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  2. Ironwolf

    Ironwolf Strat-O-Master Gold Supporting Member

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    Didn't get that much done this weekend. I did get the heater wiring installed along with some jumpers and a couple of resistors.

    heater wires installed.JPG
     
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  3. Triple Jim

    Triple Jim Guy Who Likes to Play Guitar Silver Member

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    It's better to get a few parts installed correctly than...
     
  4. StratoMutt

    StratoMutt Most Honored Senior Member

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    Is that a step by step instruction manual?

    Smart!

    In my first and only build last year I left the standoff mountings toward the end. They did not line up correctly, and modifying at that stage of the was more difficult. I just assumed they were done correctly. No step by step manual, just a schematic and wiring diagram.

    Hope Kitty gets well sooner than later. Took "ownership" of the boxes fast as is their way. :)

    upload_2020-9-21_15-52-34.png
     
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  5. BlacknBlue

    BlacknBlue Strat-O-Master

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    Good progress.

    I'm certainly no expert but I seem to recall reading somewhere that you want your filament wires away from the chassis?
     
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  6. StratoMutt

    StratoMutt Most Honored Senior Member

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    Coming along nicely indeed.

    I asked Mojotone about that. They suggested twisted, right down the center of the sockets.

    upload_2020-9-21_16-18-46.png

    I'm sure they are fine in that location as well as I have seen several examples routed like that.
     
  7. StratoMutt

    StratoMutt Most Honored Senior Member

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    It was suggested by a seemingly experienced builder on another guitar forum to leave some air space where caps and resistors are quite close to one another for heat concerns. I did just that, was easy enough.
     
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  8. Groovey

    Groovey Dr. Stratster

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    Aw man, your a brave man than I. Looks like a good start.
     
  9. Bill Moore

    Bill Moore Strat-Talk Member

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    The consensus seems to be twisted pair heaters over the sockets. Several years ago I picked up a 94 Twin chassis missing the circuit board. Fender had the heater wires paralleled and against the chassis. Since then I have built 3 quiet amps that way, so I'll continue. I see the advantage of leaving plenty of room to keep the signal wires separated, and the heaters far from them.
    94T-3.JPG
     
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  10. thomquietwolf

    thomquietwolf Dr. Stratster Silver Member

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    Every time I see one of these threads...
    Wish I had the cash to jump in...
    Did a couple BYOC pedals...
    But
    That's small peanuts
    Compared to your jump...
     
  11. Ironwolf

    Ironwolf Strat-O-Master Gold Supporting Member

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    Today I completed the chassis power wiring. Tomorrow I will start working on the turret board build.

    chassis wiring completed.JPG
     
  12. Ironwolf

    Ironwolf Strat-O-Master Gold Supporting Member

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    Worked on the turret board today.

    Got about half way through and broke for lunch.

    break for lunch.JPG

    By the end of the day I had everything populated (including the back which isn't shown). However, there was one part missing. a 1/2 watt 15K Ohm resistor which mounts between turrets 26 and 37. I already ordered a small pack which should be here Monday.

    almost done.JPG

    In the picture, some lead trimming remains to be done. It has been.

    I was asked to show the labels of the transformers. Here is the power transformer.

    power transformer tag.JPG

    And the output transformer.

    output transformer tag.JPG

    Tomorrow I'll take a soft tooth brush and my can of flux remover and give the board a good scrubbing.
     
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  13. Ironwolf

    Ironwolf Strat-O-Master Gold Supporting Member

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    Cleaned up the board and installed it.

    The testing did not go well. The initial voltage tests were spot on, but as I started testing the gain stages and tone stack circuitry, readings were all over the place.

    I began by retesting all the connections. The solder joints and grounds all tested good. Continuity from the board connections to the filter caps, pots, and tube mounts all tested good. I then started re-checking individual components.
    I discovered a couple of resistors that were not passing current. I replaced them and retested from the beginning. Everything checked out. I adjusted the power tube bias and plugged into a 2x12 cab and tried a guitar. It sounded great.

    Here is the chassis after the trouble shooting and rework.

    reworked chassis.jpg

    I mounted the chassis in the cabinet and closed up the back.

    chassis mounted.jpg

    back attached.jpg

    This is how it looks assembled.

    front panel.jpg

    This has been a very educational and fun project. I will be casting about for similar projects in the future. If I can get my recording gear setup and working, I will try to add some sound clips in the future. In the mean time, this has replaced the Origin 50 in my wet/dry rig.
     
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  14. Robins

    Robins Dr. von Loudster

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    Great job!
    Beast is up and kicking.
    Several resistors bad, wow.

    All the best,
    Robin
     
  15. Bowmap

    Bowmap I nose a thang or two. Platinum Supporting Member

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    Great job. Good looking cab for the chassis. Good tip too. I will go back and check all my resistors to make sure they meter out properly on my build.
     
  16. Bill Moore

    Bill Moore Strat-Talk Member

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    When starting up my DR clone, I only had sound when the reverb control was turned up. Seems I had misread the colors on a mixing resistor!
    (I've quit trusting my eyes, and measure everything now!)
     
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  17. Ironwolf

    Ironwolf Strat-O-Master Gold Supporting Member

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    Completed the final step. Added my own name plate.

    JTM45 - Final.JPG