Scientific products used at the college level in Physics education.

• Hello, We have two power supplies for E/M apparatus that have recently developed problems. I need a schematic to troubleshoot them. Can you supply schematic, please?
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• Do you sell a replacement bulb for the Crookes Tube?
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• Can I use the same power supply for the Crookes tube as for the e/m Apparatus and vice versa?
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• Are clamps needed for the Spark Timer? Are they included?
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• Why do the Crookes Tubes require high voltage?
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