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Down The Tubes?

Discussion in 'Electronic Basics' started by Ron Hubbard, Jun 27, 2008.

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  1. Ron Hubbard

    Ron Hubbard Guest

    I bought a bunch of vacuum tubes from a surplus electronics store
    that was going out of business, so many of them weren't marked as to
    what tubes they were-- but they were cheap. One in particular is a
    large eight inch tube that has four pins at the bottom and two
    connectors for electrode caps, one at the top and another one sticking
    off to the side in an "L" shaped arrangement.

    It's obvious it's a power tube of some sort, but does anybody have any
    idea what kind? Diode or triode? I don't know if it's a tube number,
    but marked at the base by the filaments is the number 35049... Any
    help indentifying this tube would be appreciated.

  2. Ron Hubbard

    Ron Hubbard Guest

    Sigh... No; 'fraid not. For some inexplicable reason I can never keep
    a scanner working for more than ywo or three days at the most, then
    they go dead on me. Why, I don't know, but I have the remains of four
    scanners lying about just waiting for the garbage dump. ;-(

  3. Bob Eld

    Bob Eld Guest

    Hard to say without more info, but it may be an 810, Transmitting Triode.
    The max ratings of this tube are 2750 plate voltage, 250 ma plate current,
    175 W dissipation., 10 volt fil. The base has four short pins. The grid is
    the side cap and the plate the top cap. The tube is 8 1/2 in long and 2 9/16
    diameter. The base is a bayonet mount.
  4. Ron Hubbard

    Ron Hubbard Guest

    LOL. No, I don't do that.... I scan only paper pages and on rare
    occasions, a few photos, and within a day or two after turning pages
    into .jpeg files or whatever, I usually have a dead scanner; go

    So now I quit buying scanners.; it's much cheaper that way.

  5. Ron Hubbard

    Ron Hubbard Guest

    Thanks, Tim; I'll look into it. ;-)

  6. Ron Hubbard

    Ron Hubbard Guest

    Mine doesn't *quite* look like the few pictures I can find of it; so
    it's likely to be the cheaper Chineese version I keep hearing about,
    but it's an 810! Thanks for the help; much appreciated! ;-)

  7. Ron Hubbard

    Ron Hubbard Guest

    Hmmm, I would prefer to get one that'll last me more than three

  8. amdx

    amdx Guest

    What and break a camera and phone?
  9. Ron Hubbard

    Ron Hubbard Guest

    If all I wanted to do was to post pictures, I don't even need a
    digital camera-- I can buy a cheap disposable film camera, take my
    photos, then have the developed pictures put onto a CD-- a process
    that takes less than a day. But scanners serve other purposes than
    just formatting pictures for the 'Net.

  10. Guest

    Disposable camera is a very expensive and time consuming way to do
    that. You might find the digital camera to be far more useful than you
    think. Taking something apart and want to get it back as it was?
    Pictures. Some jerk hit your car and start to drive away? Camera will
    stop them. Just as a joke I a snapped a pic of a 1" VTR scanner while
    it was rotating 1 rev / field (3596.4 rpm) and completely froze the
    motion. This is not some whiz-bang camera, just a Canon S2IS. You
    should try it - I bet you'd like it.

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