Sean de Silva
Well-Known Member
I want to get this right on the first go and avoid having to travel down the rabbit hole of a fiddly trial and error approach. I've been trying to figure this out but I'm in a quandary hence would appreciate guidance from our experienced FMs who might have been in a similar situation.
I'm considering replacing the stock 2pin power cable of my TT with Mr Murthy's high quality 3pin cable. He has advised that in order to connect the earth wire of his 3pin cable to the TT, I'd have to locate the TT power transformer screw, wrap and probably solder the earth wire to this screw which would then ensure that the TT is grounded to the AC power supply.
Here lies the abiding conundrum..
The TT already has a thin green ground wire soldered internally and connected to the ground terminal of my external phono preamp. This was done to eliminate that distinctive 100Hz buzz which it has successfully.
Hence, if I ground the TT to the AC supply as advised, would this introduce a problem that doesn't exist by creating a 50Hz ground loop hum since the TT and other gear would now be connected to the same AC supply and thereby risk introducing ground differentials between TT and other gear? i.e. TT grounded to AC power supply and to phono preamp simultaneously!
Taking all these factors into account,
Should I not ground the TT to AC earth but only connect L & N of power cable thus effectively reducing it to a 2pin cable? Or
Should I ground TT to AC earth and connect/ disconnect TT ground to phono preamp?
I'm considering replacing the stock 2pin power cable of my TT with Mr Murthy's high quality 3pin cable. He has advised that in order to connect the earth wire of his 3pin cable to the TT, I'd have to locate the TT power transformer screw, wrap and probably solder the earth wire to this screw which would then ensure that the TT is grounded to the AC power supply.
Here lies the abiding conundrum..
The TT already has a thin green ground wire soldered internally and connected to the ground terminal of my external phono preamp. This was done to eliminate that distinctive 100Hz buzz which it has successfully.
Hence, if I ground the TT to the AC supply as advised, would this introduce a problem that doesn't exist by creating a 50Hz ground loop hum since the TT and other gear would now be connected to the same AC supply and thereby risk introducing ground differentials between TT and other gear? i.e. TT grounded to AC power supply and to phono preamp simultaneously!
Taking all these factors into account,
Should I not ground the TT to AC earth but only connect L & N of power cable thus effectively reducing it to a 2pin cable? Or
Should I ground TT to AC earth and connect/ disconnect TT ground to phono preamp?
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