Bart Kent writes:
I am looking for a source and part number for a ganged rheostat (dual shaft, 400 ohm / 40K ohm, 2W), it is used as a course/fine voltage adjuster for an out dated power supply by Deltron.
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I have rebuilt a dual-ganged pot with junk box pots. I used the original shaft and wiper portion of the pot and replaced the resistor element with one of the same diameter. Thankfully, both sections weren't bad. If you don't have a junk box, there are several surplus electronics companies (findable on the internet) which sell assortments of potentiometers as well as individual ones. By the way, a lot of times, pots are not chosen by wattage but rather by value. I suspect in your case the 100:1 ratio for fine and coarse adjustment is the reason one section is 400 and the other is 40K -- it just so happened that it's rated at 2W. I would bet the 400 ohm portion is used as a potentiometer, and the 40K ohm pot is wired as a rheostat (two terminal, variable resistor) in series with one end of the 400 ohm section which sets the voltage to a control portion of the power supply, rather than controlling anywhere close to 2W of power.
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ganged potentiometers
