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An unusual TV component

Discussion in 'Electronic Repair' started by [email protected], Dec 21, 2006.

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  1. Guest

    Hello, all.

    I have an unusual question for you, perhaps you can help me. It's about
    a very clear and, to me, very puzzling childhood memory, related to a
    television set.

    When I was a child, my parents had a black and white TV as the
    centerpiece of the living room. This must have been in the mid-to-late
    1960's. It was in the U.S.A.

    Eventually, the TV went on the blink and couldn't be repaired, so my
    parents bought a new one and relegated the old one to the basement
    playroom, where my brothers and I would spend our free hours. My dad,
    though not an electrician, was fairly handy, so I suppose he wanted to
    hold onto the old TV for a while in case it could be cannibalized for
    parts. It was clear, though, that it was considered "junk", never to be
    repaired and eventually to be discarded, so it was OK for us to mess
    around with it.

    In the course of exploring the insides of the set, I came across a part
    that generated heat - it was warm to the touch. I don't remember its
    exact appearance, but it was about the size of a man's fist. I seem to
    remember it had a rectangular frame and what ever was in the middle of
    the frame protruded on both sides. The whole thing was covered, maybe
    with tape or some other sort of silvery-grey insulation, I don't
    remember. Looking back, it may have had the general shape of a small

    But the puzzling thing for me is that it generated heat, for weeks and
    months after the set was disconnected from the power mains. It gave my
    hands a tingly feeling, but it did not cause any shock or static
    electricity. It mystified me. It suggested radioactivity to me, but
    even as a child I knew that radioactive materials in such quantity
    would not be part of a TV set. Still, I made sure not to mess with it
    for extended periods of time. I dismounted the part from the TV
    chassis, and the effect continued.

    I don't remember what happened to that part; I may have just lost
    interest and discarded it eventually.

    Does anyone have any idea what could have been that heat-generating
    part, something that was warm to the touch for weeks after the TV was
    disconnected from the mains. I suppose it could have been a large
    capacitor or battery of some sort, but I'd prefer to hear from the
    experts. I suppose it's true, too, that because this happened so long
    ago my memory of it could be distorted and inaccurate, but the basic
    facts I've related here are pretty clear in my mind.

  2. You have perhaps described the horizontal output transformer. You have
    perhaps also described a psychological phenomenon.
  3. The heat generation is probably a trick of your mind. Your fingers sense
    rate of heat loss combined with temperature. For example, a marble floor
    seems colder than a wood floor, even though they are at the same temperature,
    since the marble sucks heat out faster.

    In this case, if the part is covered with a thermal insulator, it may suck
    out heat more slowly than your mind expects. Your brain may interpret this
    as 'it's warmer than I expected' rather than 'this part has lower thermal
    conductivity than I expected'.

    Lou Scheffer
  4. Meat Plow

    Meat Plow Guest

    Nothing in a tube set that would remain warm to the touch months after it
    was unplugged. Perhaps it was just a youthfull apparition?
  5. John Fields

    John Fields Guest

  6. Funny John ... it never crossed my feeble mind ... I like it HOT!
  7. David Naylor

    David Naylor Guest

    I think it is the sixties drugs return to you WOW Are you sharing
    those??? there is nothing in any tv of any time that would still be
    hot or even warm after just a few hours. unless it was next to a heater vent

  8. So did Marilyn Monroe, Tony Curtis and Jack Lemmon.

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  9. me

    me Guest

    I recall most of the TV's of that vintage had the HV transformer and
    drive tube (still have 2 or 3 sitting in a box) enclosed by metal
    shielding with the high voltage and xray warnings on the outside. It
    could have been the massive power transformer for running the da.. thing.
  10. Ken Weitzel

    Ken Weitzel Guest


    Now you have me wondering.... he said it was unplugged, but suppose it
    wasn't; and was one of those instant on sets that held the filaments up
    just a bit. Memory isn't so good anymore, but I think they were around
    back about that time.

    Anyway, if that's the case it would account of a bit of warmth, and if
    the set was sitting on a concrete floor, even a bit of the "tingling"
    he remembers :)

    Take care.

  11. ehsjr

    ehsjr Guest

    It's no wonder the set died, and could not be repaired.
    That was the perpetual motion image modulator. A few were
    manufactured in error - sort of like that stamp where the
    image was printed upside down. How do you think they got
    the images to move around in the picture tube? The
    modulator did that. Unfortunately, the fact that it would
    not shut down with the set turned off caused unavoidable
    damage, and all of the sets where the mis-manufactured
    modulator was installed died. As proof, consider that
    none of them are working today. :)

  12. That was the nuclear power pack.
  13. The name of that movie was 'batteries not included'.
  14. Rich Grise

    Rich Grise Guest

    Nah - then it'd have turned up in the soup. ;-)

  15. CWatters

    CWatters Guest

    Then heat would be the least of his problems. Too easy to get jolt from an
    old TV.

    I did wonder if there were some capacitors in there that might have held a
    charge and produced a mild shock after a few months... but I suspect they
    wern't that good (high leakage) and they certainly wouldn't have stored
    enough energy to produce heat for months.
  16. Meat Plow

    Meat Plow Guest

    The CRT could store a charge for months. They actually could rebuild a
    charge on their own.
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