Is it to keep all "common" points of reference at the same potential? Why in the hell then, do you employ a ground lift
All "common points" are same potential. No ground lift at all. Why?
First off, we need to provide shortest & safe exit of RFI & dangerous HV/LV insulation leakage off the amp. This can be done effectively by installing a device btween the star-ground & the chassis ground bolt. I have used a simple device comprising 0.1uF//10R// 2xSS diodes ying-yang parallel connected. The 0.1uF//10R is to provide exit for RFI somehow exists inside the amp. The SS diodes are to provide safe exit for dangerous +/- HV/LV breakdown voltages & currents from the amp.
The P/N junction capacitance of the SS diodes also provides exit for the VHF RFI in the amp.
my interconnects are some cheap radio scrap junk, maybe it takes 4N silver wire to hear the hum better?
I don't think you know how those "cheap radio scrap junk" built. Let me tell you.
To save manufacture cost, hence save you a few bucks to buy, those cheapie ICs are built with only one not-so-pure copper conductor for the incoming signal & use the shield as the signal return path. This is to borrow the principle of a PERFECT coaxial cable for external field cancellation.
But the cheap way they are built is no way close to the construction of a coaxial cable, let alone being "perfect". This defeats the crucial noise cancellation effect. No free lunch, bud.
You get what you pay.
The 4N pure silver ICs I built is something else. Each cable get 2 conductors of same gauge, same temper & same purity, one for incoming signal & the other for signal return. Precisely built to provide effective noise cancellation up to 1 Mhz. For audio use it should be OK proven by my years application.
I never heard of a bleeding cap as a good thing. Not all power bars have surge protection!
I don't think you know what "bleeding" means.
ALL powerline filters get bleeding caps & resistors installed across the live line & neutral line.
ALL power bars or strips get VDR across the live line & neutral line & claimed to have "surge protection". Effective or not depends on the design.
Placing the filters outside of the enclosure makes them fairly useless.
Are you sure?
RFI have to be installed inside an amp to kill the RFI somehow got into the amp. But we must not overlook tons of RFI ejected into the house powerlines via the wall outlets by those digital gadgets lying all over the place inside the house, e.g PC+wireless routers (5MHz), LCD/plasma TVs, cell & cordless phones, major electric appliances, etc etc etc.
Inline filters are therefore a must to stop those unwanted RFI going into our audio system via the wall outlets.
improvements seen by "balanced power" type of mains conditioning
Balance power supply is a classic technology to isolate RFI/noise from the load. In fact, many
expensive brandname powerline conditioners emply such technology. BUT, but my question is -
would such double wound transformers & complex electronic filters affect the music or not ???????
Masking the hum in your system by playing music louder ("can't hear it when it's playing")
Who told you I test hum "by playing music louder"?? I always test the hum audibility of any system with phono catridge input (no CD input!!) if available, with volume pot set to full but without playing any music. Only this way can tell how effective is an amp hum handling.
if dedicated mains lines alone could free your system from"digital" noise, what then do you need the RFI filters for.
Dedicated powerlines are to BYPSS the digitally polluted powerlines inside the houe. But we must not overlook tons of RFI coming from external power grids invading our audio system via the houe main breaker panels where the dedicted powerlines hooked up to.
Dedicted inline filters are indispensable.