Much like the last Substitution box the Model K-37 is easy to assemble. The resistance values are from 10 ohms to 1000k ohms or 1 meg ohm in 24 steps. A good tool for determining the desired resistance values in circuits under design or test. The video below show the testing out to make sure the knobs are in correct position.
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| Resisters through my magnifying lamb | 
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| Two knobs and switch upper center | 
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| The green jumper wires activate the knob based on the switch position | 
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| Assembled before adding front panel | 
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| Determining correct position for K ohm knob (right) | 
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| Determining correct position for the ohm knob (left) | 
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| Finished | 
 
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