Total posts : 45366
Yes, even though the AC “floating ground” prevents a direct AC line connection to the chassis, there is enough “leakage” current through the .05 uf capacitor between the “floating ground” and the chassis to give you an uncomfortable zap.
The real killer is the ground on the two RCA audio input jacks. They are insulated from the chassis but tied directly to the “floating ground” which is connected to one side of the AC line. That is the big flaw in the design as connecting the audio cable to a grounded source is a potential AC short circuit when the AC is plugged in backwards. A real hot dogger!
Audio input transformers or better yet, an AC isolation transformer needed here!
If anyone wants a copy of my hand drawn schematic of the KT-195 or pictures of the unit let me know.