• Re: Kit1 Hum - scarebus 01:06:18 09/05/04 (5)
  In Reply to: Kit1 Hum posted by 92135011 on September 03, 2004 at 00:14:06:

  Hi Mark,
  I see you finally built the Kit1.
  Is your Kit1 hooked up to any pre-amp? or
  Does the Kit1, by itself, hooked up to the speakers hum?
  Tell me more in detail.
  Chris
  
  

  ---

  • Re: Kit1 Hum - scarebus 21:49:43 09/06/04 (2)
    In Reply to: Re: Kit1 Hum posted by scarebus on September 05, 2004 at 01:06:18:

    Hi Mark,
    I saw your Kit1 on AudioReview.com. Your W4 and W11 from
    Input-Driver board are crossed. W4 should go to Left Pin 2 and
    W11 should go to Right Pin 2. Left 300B is the farthest away from the pot, and Right is the nearest to the pot, per diagram in manual.
    Instruction step 6 and 7 on W4, W11 hookups are wrong. Go by the
    diagram and the colored picture.
    What do you have on C5 and C6 of the Input-Driver board. They
    are not electrolytic caps supplied with Kit1. From the photo, they
    look like non-polarized AN caps? What uF are they. That might be
    the main source of your hum.
    Chris
    
    

    ---

    • Re: Kit1 Hum - 92135011 22:35:44 09/06/04 (1)
      In Reply to: Re: Kit1 Hum posted by scarebus on September 06, 2004 at 21:49:43:

      You sure man? I looked and saw that the manual conflicted with the picture.

      BTW I tried different combos of caps at C5 and C6. From the stock caps to other pairs of caps. Same effect
      
      

      ---

      • Re: Kit1 Hum - scarebus 00:22:12 09/07/04 (0)
        In Reply to: Re: Kit1 Hum posted by 92135011 on September 06, 2004 at 22:35:44:

        Mark,
        After going thru the wiring diagrams, W4, which is the right
        channel goes to the 300b near the pot and W11, which is the left
        channel goes to the 300B near the rear of chassis. So, yours are
        correct and the diagram is wrong.
        Regarding to hum, make sure the signal white wires have good
        solders on the output rca tags. Make sure the nuts on the rca
        outputs are tight. This amp should be dead quit.
        Chris
        
        

        ---
  • Re: Kit1 Hum - 92135011 12:00:48 09/05/04 (1)
    In Reply to: Re: Kit1 Hum posted by scarebus on September 05, 2004 at 01:06:18:

    It's complicated.
    When no source is connected it hums (input empty)
    when a source is connected it hums less, but still hums
    When it plays, it sounds good, but there is still hum.

    
    
    
    

    ---

    • Re: Kit1 Hum - scarebus 17:20:12 09/05/04 (0)
      In Reply to: Re: Kit1 Hum posted by 92135011 on September 05, 2004 at 12:00:48:

      Mark,
      1. make sure the brown and blue wires coming out of the main
      tx are routed close along the chassis and only breaks away
      from the chassis when they meet the input-driver board. Then
      give ample slack going over the caps.
      2. when you installed the ground terminal on the chassis (the
      green wire from switch, extending to PSboard), did you scrape
      the black paint to expose bare metal before installing the
      ground tab. If you did, install a star washer( not the inside
      star, but the outside star, this will grab more into chassis)
      between the chassis and the ground tab. This way you get a
      positive grounding.
      3. make sure all green wires have good solder on them.
      4. make sure the signal yellow wire's pigtail(input-driver side)
      have good solder connection. DID YOU PREPARE THE SIGNAL WIRE
      YOURSELF OR WAS IT ALREADY TERMINATED?
      5. If you can, send me a picture of your wiring.
      Good luck.
      Chris
      
      
      

      ---
• Re: Kit1 Hum - EAnderson 21:10:12 09/03/04 (0)
  In Reply to: Kit1 Hum posted by 92135011 on September 03, 2004 at 00:14:06:

  hmmmmmmm, I just built a Kit 1 two weeks ago and it is humless... dead silent with 96 db speakers (Bottlehead straight 8's).
  You could have a ground loop, have you checked ground (earth) with your voltometer (ohms)? Have you checked the voltages that the instructions supplied as well? In addition, how are your wires dressed....nice and clean like the brocheur? Did you jumper all three wires on the PSB?
  The Kit 1 is an amazing amp and the instructions are good (but soon to be much better) and you can build it nice and hum free.
  Part of the DIY process is troubleshooting, so don't give up!
  Rgds,
  Erik
  
  

  ---
• Re: Kit1 Hum - Kamigo 04:33:33 09/03/04 (0)
  In Reply to: Kit1 Hum posted by 92135011 on September 03, 2004 at 00:14:06:

  You could have a cold solder joint somewhere (solution: reheat them all until the solder is shiny when cool). You could have dirty AC - are you powering it through a filter of any kind? You may have missed a connection to ground somewhere too. The shortest answer is check everything again, and then again.
  
  

  ---

This post is made possible by the generous support of people like you and our sponsors:

Sonic Craft

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---