Brumberger 5x7 contact printer question

Discussion in 'Contact Printing' started by Murray@uptowngallery, May 25, 2008.

  1. Murray@uptowngallery

    Murray@uptowngallery Member

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    I was just given a 5x7 Brumberger contact printer.

    Inside there are three incandescent lamp sockets and a sheet of (flashed?) opal glass.

    I looked online and found a picture of one with a frosted lamp, a clear lamp, and a red lamp.

    The red lamp I understand...to get things set up, adjusting the easel blades etc.

    Was there some purpose to using a clear vs a frosted lamp, considering it has an opal diffuser? Or maybe the clear lamp happened to be smaller, for different exposure times? It doesn't appear to have a switch to chose which lamp lights...it looks like it has one momentary switch to turn it on with pressure on top.

    Thanks
     
  2. Nick Zentena

    Nick Zentena Member

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    One thing to check is how powerful the thing is. IIRC most [all?] contact printers were aimed at contact paper. Enlarging paper will be too fast.
     
  3. Murray@uptowngallery

    Murray@uptowngallery Member

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    OK, maybe I put a Black Light CFL in it & use it for alt-process.

    Or the smallest lamp I can find for reg. paper.
     
  4. richard ide

    richard ide Member

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    Murray,
    Plug it in to a light dimmer and it will probably work well.
     
  5. Murray@uptowngallery

    Murray@uptowngallery Member

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    I had a passing thought about that but it got knocked over by another thought.

    I have a Variac that should work.

    Murray
     
  6. Joe VanCleave

    Joe VanCleave Member

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    Or try a motor speed controller instead of a variac; these chop the duty cycle, rather than the peak voltage, so the color temperature of the lamp won't red shift as badly.

    ~Joe
     
    Last edited by a moderator: May 29, 2008