Question about Olympus Microscope Olympus CHBS Microscope - All Olympus 4x, 10x, FL 40x, HI 100x

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I have N Olympus CHBS that has been a workhorse in my Veterinary Medical practice for almost 30 years. Just yesterday, the rheostat that provides variable voltage to the bulb gave up the ghost. I have temporarily bypassed the slide rheostat in order to use the scope, of course the bulb is now on full intensity. I would really like to source a new slide rheostat for this scope. I believe it is an Alps part and has a number 500KC imprinted on it. Amy touts are appreciated!

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