I need advice for power cords

I ran 4 separate 20 amp runs with extra heavy wire into two hospital grade 20 amp double outlets. Looking back I wish I would have run three of them.

You might already have it, Any larger than 12  would have moved it to 25 or 30 amp, Still a single run, but man oh man, what are running, LOL
20s are 2400 watt continues right.. so 4 is real close to 10000 watt continues. I run 3 20 in the house sound room, and 4 15, in the shop, both stereo rich environments.  Both can and will exceed 145 db, with a very low THD...Glass is taped in the shop when I'm tinkerin' for sure.
Yup Yup..

Concrete crumblers at you place?

Regards

Upgrading the house wiring is the best you can do for your equipment. 1. separate phase (if you have 3 phase system)


You mean 3 phase elect, or 3 phases of something else? Lost me there.
Who has 3 phase elect. not many at all, ay. Single phase 220-240.

Voltage maintainers, and cleaners go a long way, NOT SURGE Protectors, useless, to maintain voltage..1000.00 wow, go a long
way with that, in materials. You can talk to a GOOD electrician for
about a thousand dollars... Really!!! No work though..LOL

Regards

In Europe you can have single phase or a 3-phase electrical system in your house

So your in the Europe?. I have 3 phase access three poles down. Single phase at the house.  300 amp service, and a heck of angument to keep
my 45 + year old copper drops. I had to downgrade from 400 to 300 trying to replace the old 125 amp service.  I didn't and wouldn't change it.. PG&E wanted to use aluminum. The 3 phase on top of our service line were upgraded 30 plus years ago from 8kv to 20kv with new ALU line.  A few of us refused the new drop upgrade, I'll keep the copper....Whole different story..

The copper drop story.. lol


 Many of you have much more experience with cables than I do so what do you recommend and I can do the research. On a side note my McIntosh MC75's are vintage so old thin manufacturer cables and probably shouldn't change them. 

Actually you should, especially if it's the older MC75. Great power supplies demand less of a cable, kinda!! It also lets you ADD a 
ground for protection and, CAN help reduce floor noise in some cases.
All my old gear gets new, better, bigger conductors, to a point. Pure copper good insulator, high voltage cable if it will fit. There is a point where bigger is NOT better, like breaking stuff, or drilling on the old mac cases, NO NO.. The old Macs like good multi strand pure copper.  Though I've seen quite a few hardwired from PC to speaker runs, big improvements in some.
Regards

I am an electrician myself and I worked at a cable company as a (test)engineer and I have some equipment at home (I am not on the level of a brilliant designer like Bruno Putzeys or Nelson Pass) but I understand the importance of low R,L,C values and a good foundation for your equipment.

I'm with you all the way, the little stuff count the most and cost the least.
Few approach with "fix" it's more like. CHANGE..it..
Listen
Test 
Think,
Fix
then CHANGE, if it just can't be fixed, correctly within a reasonable 
amount of time.  
Worked for me for almost a half a century, as a heavy mechanic..yup yup

Regards

millercarbon3,258 posts03-02-2020 3:16pmhickamore reasonably asks:

But Miller! What about you! You did all that stuff! https://systems.audiogon.com/systems/8367  Yeah which is how I learned what its worth and more to the point what its worth relative to other things you could do instead.

I did the addition 35 years ago, with the intent of having a HT environment
The old was knob and tube the new romex. 2 15s were installed at the time. 15 years ago I added 3 20 on the outside in conduit. Took 4 hours and a bit of swearing. I grove another copper ground rod. I had about 8 hours with the all the goodies. Hubbell 20s @125. It was a real upgrade for me. Left side, right side, center for everything else. I used 3 in wall mount Trip lite 2400mg. Lights, TV and all the cable stuff on its own cleaner, crazy dirty power supply from the cable company.

I've learned A LOT in the last couple of years. Little bit at a time...
Room treatment, placement, GREAT VAC, cabling, gettin' there. yup yup

Regards

What do you think about upgrading the power cables for the MC75's?
I know they are vintage but would really like to improve the whole system sound quality.  I'd like to improve everything without buying new amps. So what are your opinions and how could it be done.

Read above. CHANGE them. The PS on Mac make them a lot less prone to bad cable. That is the reason they sound good with that dinky PC. Upgrade it, you might get a pleasant surprise. First thing on the list after a newbie arrives here. Listen, listen, listen, change the PC. Then listen. Hee Hee you'll like it..Not to expensive, great upgrade..

Regards

andrei_nz134 posts03-05-2020 9:56pmDude, these are the basics. 1. You need sufficient gauge. 2. Good quality termination (ie strong set-screw contact). 3 Decent materials. Copper or silver (don't get distracted by 'nines' or other snake oil). 4. They really should be flexible. There is truly no excuse for for the inflexible cables.

I just saw cables that have all types of materials used in construction, they are not flexible, they are expensive, they work VERY well.

What is "nines"? Like dressed to the nines?

If you think about WHY cable is flexible, it is because of the LOOSE weave, size of the conductor and the flexibility of the jacket(s).

Why should it be flexible, like in car audio, WHY. The conductors are large, and very flexible. ALU clad wire, most of it.  Other than easy install, there is no reason. Home is another, WHY? Again it doesn't have to be.  I've seen a few systems hardwired with LONG runs. Amazing sound, solid conductor silver wire (romex like), and valve amps..