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Carbon Composition Resistors

Roger B


A significant number of our accelerators use old style Allen Bradley 2W carbon resistors like these:

c49bf42fa082a060e0cceb7b2961599d-huge-160906-def-widerstand1.jpg


The accelerator supplier, IBA, can no longer supply them. They have an alternative but do not recommend mixing old and new due to different aging characteristics.


Does anyone know of a supplier of these resistors, generally in the meg ohm range? I would only be looking for small numbers to repair damaged strings like above.


Anecdotally there was a previous problem with this type of resistor where the manufacturing process was changed so that the internal end of the leads was cut to a chisel point which resulted in them exploding when a high voltage was applied.


Best regards


Roger

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  • 0
    The problem is that resistors are not perfect. They may have the same value when measured with a low DC current but the response with high voltages and frequencies is different. If I mix resistor types the voltage grading will not be constant which can result in beam instabilities and sparking.

    I can replace the complete set but that will cost quite a few 1000s.


    Best regards


    Roger
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  • 0
    The problem is that resistors are not perfect. They may have the same value when measured with a low DC current but the response with high voltages and frequencies is different. If I mix resistor types the voltage grading will not be constant which can result in beam instabilities and sparking.

    I can replace the complete set but that will cost quite a few 1000s.


    Best regards


    Roger
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