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Boothill 5e3 No Sound

Discussion in 'Shock Brother's DIY Amps' started by Paul Strat, May 13, 2018.

  1. Preacher

    Preacher Friend of Leo's

    Apr 17, 2007
    Big D
    Paul,
    First off I would say keep working at it. You are really close and I am sure it will be one or two connections that separated. This group will help you persevere.

    Secondly, do a little web search or even check out RobRob's page on lead dress and shortening those circuit wires as much as possible to reduce hum.

    And Thirdly, it appears that some of your twisted wires have come apart a little (I am sure with the probing and poking), twist those as tight as you possibly can as close as you can to the connection points to reduce hum.
     

  2. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    Only a rare pop
     

  3. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    Thanks Preacher
    I did leave the leads a little long in case I had to cut and resolder. Once I get everything right I’ll go back and shorten those.
     
    King Fan likes this.

  4. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    Pin 7 good 8 no resistance
     

  5. corliss1

    corliss1 Friend of Leo's Gold Supporter

    Sep 13, 2008
    Lansing, MI
    No resistance as in zero ohms to ground? Or no continuity to ground at all?
     

  6. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    Ok, got 35v back on the coupling cap and pin 8. Still no resistance to ground on 8
     

  7. corliss1

    corliss1 Friend of Leo's Gold Supporter

    Sep 13, 2008
    Lansing, MI
    So it sounds like we need to check for continuity to ground on the 56K and 1.5K network there.
     

  8. D'tar

    D'tar Tele-Afflicted

    Jan 11, 2013
    WNY
    35vdc on V2,p8 sounds about right. Can you give us 6,7,8 vdc again now. What did you do to get voltage back?

    you're not ohm-ing a live circuit right?
     

  9. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    Lead to pin 8 was pinched under tube socket nut.
    6 121
    7 19
    8 54
    No not ohming live
     

  10. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    Have both now.
     

  11. corliss1

    corliss1 Friend of Leo's Gold Supporter

    Sep 13, 2008
    Lansing, MI
    So do we have sound yet? :D
     
    D'tar likes this.

  12. D'tar

    D'tar Tele-Afflicted

    Jan 11, 2013
    WNY
    Those numbers vdc look good.
     

  13. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL

  14. corliss1

    corliss1 Friend of Leo's Gold Supporter

    Sep 13, 2008
    Lansing, MI
    so the voltages are right, but no sound. This is where I'd start signal tracing.
     

  15. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    Does polarity matter on the green/greenblack from the PT?
     

  16. D'tar

    D'tar Tele-Afflicted

    Jan 11, 2013
    WNY
    Agreed. with voltages looking proper. While probing the plates and grids of each tube you should hear scratching/popping. Start at the 6v6 with volume at about half. as you move toward the input(v4,v3/v2/v1) the pop should get louder as the signal is amplified through the circuit. If you have no pop/scratch on the 6v6(v3,v4), look to the output/speaker wiring. if you have pops all the way back to v1 then the input jacks/wiring are suspect.
     

  17. corliss1

    corliss1 Friend of Leo's Gold Supporter

    Sep 13, 2008
    Lansing, MI
    If the green/greenblack is your heater wires, then no. If they were wrong the tubes wouldn't glow.
     

  18. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL

  19. Paul Strat

    Paul Strat TDPRI Member

    Age:
    58
    98
    Apr 7, 2017
    Muscle Shoals, AL
    I have continuity on the speaker cable but no resistance
     

  20. corliss1

    corliss1 Friend of Leo's Gold Supporter

    Sep 13, 2008
    Lansing, MI
    Yes - those would have a polarity. The boothill docs should tell you.
     

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