Brumberger 5x7 contact printer question

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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
 

Nick Zentena

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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.
 

richard ide

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

Joe VanCleave

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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
 
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