hoan_tran2 Posted November 20, 2007 Share Posted November 20, 2007 Hi, I purchased an old Beseler 45MXT with a 45S Color head. The enlarger came with a heavy, square 6x6 box. Based on the appearance, it appeared to be a transformer. I don't know what it is used for and how to connect it to the system. Any advice on this would be helpful to me. One more question: The color head used a 82V light bulb. If I plug it directly to the household 120V line, will I damage the bulb? Regards, Hoan Tran Link to comment Share on other sites More sharing options...
john_shriver Posted November 20, 2007 Share Posted November 20, 2007 The large box is probably a voltage regulator, takes in 120 volt line voltage (varying over time), and puts out a stable 82 volts (unchanging) for the light bulb. (It could be a "ferroresonant" transformer, if there's a capacitor in there as well it likely is.) Having the voltage to the light bulb change from time to time is "double bad" with a color enlarger, since it screws up both the exposure and the color balance. More modern enlargers use low voltage light bulbs (say 12 volts), and a solid state voltage regulator. Link to comment Share on other sites More sharing options...
jim philopena Posted November 21, 2007 Share Posted November 21, 2007 The 45S colorhead came with a built in stabilized power supply to transform and regulate the 120 volts AC to the 82 Volts needed for the bulb. I have no idea what the former owner used the outboard device for, but it is not normally needed to correctly run the head. If there were any markings you could Google or post here, maybe a better idea of what it was could be had. But, unless the former owner modified the head, you have a large paperweight. Link to comment Share on other sites More sharing options...
hoan_tran2 Posted November 21, 2007 Author Share Posted November 21, 2007 Thank you John and James for the responses. The part I mention was encircled in the attached picture. Regards, Hoan Tran Link to comment Share on other sites More sharing options...
hoan_tran2 Posted November 21, 2007 Author Share Posted November 21, 2007 Hi, I'm sorry for the first attachment that could not be read. I attach the image again. The "transformer or voltage stabilizer could be seen in the picture. It was loosely hung on the lower horizontal bar. Regards, Hoan Tran Link to comment Share on other sites More sharing options...
jim philopena Posted November 23, 2007 Share Posted November 23, 2007 That was a commonly used voltage stabilizer used with the standard non-color head. Or rather just the plain lightbulb. There is no need to use it with the 45s colorhead. Link to comment Share on other sites More sharing options...
hoan_tran2 Posted November 23, 2007 Author Share Posted November 23, 2007 Thanks again James, Hoan Link to comment Share on other sites More sharing options...
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