[Harp-L] Ground Switch on amp?



Hey List
I collect Vintage Kay tube amps for show and for performance with diatonic and chromatic, have them in all sizes and speaker configurations.
Some of the larger and higher wattage ones have a ground switch.  What is this for? Is it because there is a 2 prong plug and grounding plugs were not used or widely used in the late 50's and early 60's? any thoughts?

Thanks
Brian in Brooklyn 



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