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amplifer for old tv earphone jack?

Discussion in 'Electronic Repair' started by micky, Jan 25, 2013.

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  1. micky

    micky Guest

    amplifer for old tv earphone jack?

    Does anyone know of a low-to moderately priced amplifier suitable for
    plugging into the earphone jack on a 10 or 20 year old TV, whose
    output only has to be one or two steps higher than the input, to power
    my woofer and midrange**. Checking Amazon and ebay, I only find
    expensive things, 100's of dollars, and things for telephones and
    computers. . Maybe I'm not searching on the right words.

    Well, this is sort of what I had in mind
    http://cgi.ebay.com/ws/eBayISAPI.dl...akeTrack=true&ssPageName=VIP:watchlink:top:en
    but it's a pre-amp for magnetic phonograph cartidges to get the output
    to be as high as the older style (?) cartridges made, to plug into an
    amp. It certainly won't power a speaker iiuc.

    Thanks a lot.


    Details.
    **or maybe a tweeter. It's been 30 years since I mounted the speaker
    board in the corner between the ceiling and the wall. They came from
    a 1930's phonograph/radio, and worked well up until 4 years ago, when
    the tube TV in my bathroom broke. I posted about this a couple years
    ago, how the newer transistor TV was too weak, or something, to power
    the speakers, and nice folks here told me impedance didn't match, or
    something.

    So for a year or two I've tried to use the little built in speaker and
    the electronic remote control***. It seemed to work okay, so-so, but
    the tinnitus in one ear got worse last year, and the Ear Nose doc
    tells me at age 66 my hearing is not as good as it was. Most of the
    time no problem, but watching tv in the bathroom has become is a real
    problem.


    ***As opposed to the wired volume control I mounted in the wall nxext
    tot he bathtu and near the toilet, in the wires between the mini-phone
    plug and the speakers.
     
  2. This is, in principle, a legitimate question. But the content and -- uh --
    tone of the thing sound decidedly like a put-on.
     
  3. gregz

    gregz Guest

    That phonograph amp is fishy. Gee, computer speakers sometimes have jacks,
    and on eBay, how many used amps can I count.

    Greg
     
  4. micky

    micky Guest

    I've tried books and magazines in the tub and it's too hard to keep
    them from getting wet.. Also, even in my "modern", that is, shallow
    tub, the shelf I made, designed so it can't slip into the water, is
    too high to comfortably rest my arms on it. Once I let my arms and
    hands go into the water, then I can't change the page without getting
    the book wet.

    This was all a big disappointment. I wouldn't have made the shelf if
    I didnt' want to read. But that's the way it is. (Reading while I
    take a shower seems even less practical than when taking a bath.)

    As to the toilet, I don't spend enough time on it to read anything.
    It's the other way around. When I'm in the middle of watching a tv
    show in another room and I have to go to the toilet but don't want to
    not lose track of the tv show, that's the only time I have the tv on.
     
  5. micky

    micky Guest

    Good point. For the last 35 yearrs or more, an electrical outlet near
    the sink in a bathroom,or kitchen (or near a laundry tub, maybe) ,
    and any outdoor receptacle has to be GFI (or the newer Arc-something)
    so that any inequality in current between the hot and neutral trips
    the breaker.

    In my house, , 34 years old, there is one GFI breaker in the breaker
    box, and it powers all the receptacles near water and probably nothing
    else. Since then, individual GFI and Arc-fault receptacles have
    become popular, and one of them will also protect any receptacle
    downstream from a GFI

    The receptacle is by the door, 6 or 8 feet from the tub. I can't
    reach it or the tv resting on the counter also at the far end of the
    room. There is no receptacle between the sink and the tub (although
    I don't know if one would be legal or not. Maybe not. )

    I used to worry about adjusting the volume, but I measured the
    voltages on the sound output jack and it was low. Plus I dry my hand
    before I adjust it, and it has a big plastic knob over the metal shaft
    of the potentiometer. And iirc, the shaft is not connected to the
    circuit. Anyhow, after 20 years I stopped worrying.

    Usually a bath takes about a half-hour.
     
  6. micky

    micky Guest

    Nope. I also had a phone handset in the bathroom until I had trouble
    with the phone wiring in general and I went to cordless phones. In
    the wall plate with the telephone jack, I also put in a toggle to
    answer the phone with, a piezo "ringer", a switch to turn the ringer
    off, and a neon light to show if the phone was ringing when the ringer
    was off. I don't get many calls when I'm in the tub, but over 25
    years, they mount up. I hung the handset from the towel bar. When I
    finally move, I'm taking this with me.
    Thanks for the idea.

    I'm using a computer speaker in the bedoom, with a tv with somewhat
    garbled sound. I guess it is a bad speaker because the sound from the
    add-on speaker is fine.

    But in the bathroom I want to use the better speakers, a 12" woofer
    and an 8" midrange, that cmae from the record player. It will also
    allow me to easily adjust the volume using a knob, instead of a remote
    control which is inconvenient, takes longer, and I might end up
    dropping in the water.

    Although adjust the volume seems to be less necessary since the middle
    of December when the law against raising the volume on commercials
    went into effect. It must have really made a difference, since I
    don't remember turning it down and then up with each commercial, on
    any tv in the last month.
     
  7. micky

    micky Guest

    Thanks. Good idea. Do you think I can get something small?
    It's amazing. Three or four years ago, someone offered me a Marantz
    tuner and matching amp for 10 dollars. He begged me to take it, but I
    had no room.
     
  8. I can't believe that electrical codes your side of the pond
    This is The Land Of Freedom, where anyone can do anything they like.

    An episode of a soap-opera spoof, "Mary Hartman, Mary Hartman", had a TV set
    falling into a bathtub and electrocuting a 9-year-old evangelist.
     
  9. It's amazing. Three or four years ago, someone offered me a Marantz
    Not even in the bathroom?
     
  10. micky

    micky Guest

    Nah. Too big. I have a radio in the bathroom. It sits on top of
    the TV.

    It has no remote control at all, so I can't turn the volume down when
    the bathtub is full and water noise is gone.. One reason I use the
    TV more.
     
  11. Try working as a broadcast engineer, running film all day. You are
    You could probably write off Depends as a legitimate business expense.
     
  12. micky

    micky Guest

    Good to know.
    I haven't done any of these things, but truth be told, if there were
    no electrical outlet in the bathroom, I'd run an extension cord from
    whereever there was one. (and when I had time, I'd put in an outlet.)

    But Americans use the outlet for a lot of things, hair dryer, electric
    toothbrush... As early as 1968, I was on a house tour** and on the
    long counter in the bathroom were both of these and a "facial sauna",
    which iiuc blew warm moist air on the user's face when she leaned into
    the "funnel" part of it. If I'd had a camera I would have taken a
    picture of the array, which they seemed to be proud of. That was 45
    years ago. By now there must be lots of other electrical things for
    the bathroom, though I don't know of any. --- Well, there are
    waterfproof radios and telephones for the shower stall itself, but
    they run on batteries and aren't dangerous.


    ** (usually as in this case sponsored by community associations of
    n'hoods with nice homes, but whose home prices which have either
    fallen or might be about it. They would get 10 or 12 house to open up
    for visitors, Uusually they weren't for sale, but the idea was to
    show how nice the homes were inside and to point visitors who were
    actually shopping to homes in that n'hood, to keep the n'hood from
    running down. All the house tours I know about have been successful
    to very successful.

    Oh, yeah, I was born in January and our house was built in the 1930's
    and the bathroom was the size of a small bedroom -- they hadn't
    thought of making them tiny yet -- and my mother bought an electric
    heater to warm the room before she gave me a bath. (I still have the
    heater from 1947, and it's in excellent condition. Even the cord. )
     
  13. micky

    micky Guest

    Or a big bottle from apple juice.
     
  14. micky

    micky Guest

    As you probably know by now, we don't have special two pin sockets.

    And I had forgotten about electric razors**, which don't even have to
    be used in the bathroom, except I guess there is a mirror there. But
    why does one need a mirror to find his face?

    **I found out in college that if I stopped shaving, my pimples went
    away. I thought having a beard would make it harder to wash my face
    and that would make the pimples worse, but there seemed to be no truth
    in that. (The important thing was not to grind up the whiskers and
    force the pieces into my pores. )

    Then I figured out that I could still shave with a blade.
     
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