Al (Rodman), what he's saying is that he is using a cheater plug to defeat the connection of the safety ground pin on the preamp's power plug to the safety ground pin of the PS Audio unit's outlet. Therefore the preamp's chassis has no connection to safety ground, other than perhaps (depending on the internal grounding configuration of other components in the system) via the return conductors of interconnect cables going to other components, and from there via the safety ground connections of those other components.
If a fault were to develop in the preamp that shorted the AC line voltage to the preamp's chassis, there are various scenarios in which that could result in both a shock hazard and a fire hazard. How great are those risks? Very, very small. But it cannot be said that they are zero. Grimace, as I said in your thread on the original problem, it's your call.
BTW, a suitably chosen Jensen audio isolation transformer (one of those shown towards the bottom of the page), as suggested in the Jensen paper I linked to in my post of 3-30-12 in the other thread, would most likely make the whole issue moot.
Regards,
-- Al
If a fault were to develop in the preamp that shorted the AC line voltage to the preamp's chassis, there are various scenarios in which that could result in both a shock hazard and a fire hazard. How great are those risks? Very, very small. But it cannot be said that they are zero. Grimace, as I said in your thread on the original problem, it's your call.
BTW, a suitably chosen Jensen audio isolation transformer (one of those shown towards the bottom of the page), as suggested in the Jensen paper I linked to in my post of 3-30-12 in the other thread, would most likely make the whole issue moot.
Regards,
-- Al