Has a DBT ever saved a device of yours from death?

Discussion in 'DIY' started by z-adamson, Feb 10, 2019.

  1. z-adamson

    z-adamson Super Member

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    It has saved two devices of mine from an early death.

    hk citation 16a
    hafler dh200

    In the citation, I was removing the screen cover on the heatsink to take a reading from an emitter resistor with the amp on and hooked to the DBT. As I was removing the cover, I dropped in into the heatsink creating a short from an emitter resister to chassis ground. Light went BRIGHT and the amp is fine. What would have happened without the DBT? Who knows

    With the hafler, a solder blob fell onto the bridge diode shorting the transformer lead to chassis ground. Bulb went BRIGHT when I fired it up. The transformer would surely be toast had it not been for the bulb.
     
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  2. dbxdx5

    dbxdx5 AK Subscriber Subscriber

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    FWIW one lesson I'd take away from the first experience is to avoid doing any disassembly while the unit being repaired is powered up.
     
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  3. z-adamson

    z-adamson Super Member

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    Yup....

    I didn't give much thought to the possibility of dropping the cover into the heat sink.
     
  4. eizner23

    eizner23 Well-Known Member

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    Blew up a Sony ta-1050 with a dim bulb connected. Shorting something that hit the heatsink while powered up still havnt sorted it out. Dim bulb didnt save my ash on this occassion.
     
  5. z-adamson

    z-adamson Super Member

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    Wrong size bulb?
     
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  6. inductor

    inductor Super Member

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    saved me several times, i am grateful for my light bulb and my bulb feels for me ?
     

     

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  7. eizner23

    eizner23 Well-Known Member

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    Might have been 100w bulb, amp is >40w
     
  8. gadget73

    gadget73 junk junkie Subscriber

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    SS stuff is a bit more fragile than tube gear. Even current limited, sometimes shorting the wrong thing is instant death.
     
  9. paultlaw

    paultlaw Active Member

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    Last thing i blew up was because i put a dead bulb in the DBT, released some magic smoke.
    All my fault. But generally i do not have many issues - i love seeing the bulb dim right down!
     
  10. elnaldo

    elnaldo Addicted Member

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    Saved recently a 110V pioneer sx780 plugged to 220V .

    And many other that I don't remember right now.
     
  11. Binkman

    Binkman AK Subscriber Subscriber

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    I think you may have had a coincidence and the bulb blew and you just didn't notice it.
     

     

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  12. gslikker

    gslikker Super Member

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    Fortunately, the bulb will stay out that way, but if the smoke still gets out, it is magic, indeed :rflmao:
     
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