RCA Delta 40, 41, 42 PTV Lenses

Discussion in 'Electronic Repair' started by Robert McPherson, May 26, 2004.

  1. Hello!

    I work on many RCA PTVs in my shop. I have often wondered what is the
    technical difference between the Delta 40, 41, and 42 lenses used in
    many of the PTK195 chassis (52" & 60") Why, for example, in a recent
    60" TV, were Delta 42s used over the blue and green CRTs and a Delta
    40 used over the red? In a recent 52" TV, Delta 41s were used over
    the blue and green CRTs and a Delta 40 was used over the red. Why
    would a 52" & 60" PTV use the same Delta 40 for red?

    Robert McPherson

     
    Robert McPherson, May 26, 2004
    #1
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  2. Robert McPherson

    JURB6006 Guest

    It has to do with the wavelength of the light. You'll also notice some sets
    have the blue CRT mounted slightly closer to the mirror.

    All this probably makes it easier to converge in the slimmer cabinets, and also
    corrects the center/corner optical focus (I think it's called scheimflung, some
    cieling mounted projectors have two wing nuts on each lens for this purpose)

    JURB
     
    JURB6006, May 27, 2004
    #2
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