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No Signal on Bright 1 Input Jack for 5E3

Discussion in 'Shock Brother's DIY Amps' started by James Knox, Oct 29, 2020.

  1. James Knox

    James Knox Tele-Holic Silver Supporter

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    My first attempt at using Shielded Cable (and hanging the 68ks) for Input Jacks to V1.

    I followed RobRob...

    FA040A70-1D9E-4B5A-A8ED-B1764E2F121A.png

    Here are my pics...

    8A54A396-D4CA-4EE6-959C-A76A9FD05011.jpeg
    26796749-1F16-4549-8356-9EA347386D04.jpeg 5494764F-366F-413E-9D37-09F778C25CF4.jpeg

    Grounding only at the Jack side and NOT at the Tube...

    947A55A3-AF90-4AAA-BE7D-20E1D13CCBC3.jpeg

    All three other jacks work correctly. I first thought that maybe the ends of one of my 68k was grounding against the shielding so I made another lead making sure that was not the case prior to shrink wrapping.

    I did it like this...

    A1CAC0A8-7133-4907-BDEC-5F3C4A7344B8.jpeg

    When I measure tip to sleeve on a guitar cable plugged in I get these readings:

    Normal 1- .634M
    Normal 2- 130K
    Bright 1- 1.1 ohm
    Bright 2- 125 K

    I triple checked over all of the resistors (68k and 1M) all in spec.

    What am I overlooking?

    Thank you!
     
  2. Peegoo

    Peegoo Poster Extraordinaire

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    Looks like you're missing your signal connection from bright 1 hi to bright 2 lo.

    [​IMG]
     
  3. Tom Kamphuys

    Tom Kamphuys Tele-Holic

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    Your bright 1 resistance measurement indicates a short.
     
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  4. Peegoo

    Peegoo Poster Extraordinaire

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    Make sure the switch on the jack is opening when a plug is poked into it.
     
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  5. James Knox

    James Knox Tele-Holic Silver Supporter

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    Sorry for the blurry pic, but the connection IS there...
     
  6. James Knox

    James Knox Tele-Holic Silver Supporter

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    Yes, I did check that.
     
  7. James Knox

    James Knox Tele-Holic Silver Supporter

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    a short, like as in the resistor is bad?
     
  8. D'tar

    D'tar Friend of Leo's

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    :rolleyes:
     
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  9. Lowerleftcoast

    Lowerleftcoast Friend of Leo's

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    1.1 ohm meter reading indicates continuity. A short.

    The shield is touching the resistor lead or inner signal wire.
    The jack switch grounds the signal.

    Something like that.
     
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  10. James Knox

    James Knox Tele-Holic Silver Supporter

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    F7CA82D1-68FE-4E9D-96B1-A6E4BE0C8F12.jpeg
    Found it! Thank you Brothers...
     
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  11. D'tar

    D'tar Friend of Leo's

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    Ahhh....

    The Blob!
     
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  12. James Knox

    James Knox Tele-Holic Silver Supporter

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    Hahaha - just when I thought I was getting pretty good at my soldering chops!
     
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  13. sds1

    sds1 Tele-Afflicted

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    These are $15 and totally worth it! I bought them for SMD work but I use them for soldering inspections now too. These will keep ya honest!

    https://www.amazon.com/gp/product/B071GWM9QN/?tag=tdpri-20

    [​IMG]
     
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