not enough difference to worry about. Remember to connect pin #1 to the metal chassis at the connector. * * * * * * * * although the metal ones will connect the cable connector shell to the chassis (so added shielding).

Two decades ago, some printers and desktop PC's had power cords with ferrite chokes. These were to reduce RF emissions from the unit,.

The best cables are made by Belden.

Small typo there. It's more like 100 megahertz.

with 15 meter (50 foot) long RCA interconnects there will be differences in background noise levels. With 1 meter RCA interconnects, it's doubtful. But for interference problems, length isn't the big factor and the cheap ones might do better.

As the types of tests that Amir uses are the ones available in Audio Precision test equipment and similar to the tests done by others with skill, I would trust his measurements. The 'Audio Science Review' forum is open to discussions about suitable test protocols.

No the early 1970's Heathkit amps and control amps had a lot of hiss.

What are you (and everyone else) missing? Technical information about the cable's construction.

Well designed components should be insensitive to any reasonably well designed external power supply.

Hiss is often a 'stage gaining' problem. That's when the level controls for all the stages are not set to their best position and one stage needs to do a lot of amplification.

Take photos of each step of the dis-assembly, so later you can put it back together. In the Fall you might get a high school auto shop to paint it.

Well I do it all the time (insert headphones) but the volume is at a reasonable level for the headphones.

You are not the only one! Now that I'm old, it's only the low frequency noise (that others don't notice) that bothers me. My wife has one of her mother's wrist watch's. I make her keep it in a drawer in another room, so I don't hear the ticking. In the pre-CD era, I would go into my buddy's...

Have you tried speaking more to the side of the mic, rather than straight on? Have you tried speaking father away from the mic?

a little "Kill-a-Watt" meter (or similar) will do a good job of measuring power line Voltage, Current & Power. with any DMM if you measure before and after the isolation transformer, most of the meter's errors will cancel out.

Sure they are good. But there are (were) some components that do funny things to their inputs when powered off. In effect, their input circuit becomes a diode.

Isolated Ground receptacles are for circuits that are wired with metal conduit (ridge or flexible). Romex® cable does the isolating all by itself. Also, post #1 in this old thread is well worth reading.

For great wire and cable providers in the US my first choices are: Markertek https://www.markertek.com/ Redco https://www.redco.com/ Have Inc http://store.haveinc.com/default.aspx Lemo connectors are great, but real pricey.

To avoid confusing @gregorio and @sander99, instead of writing: 'ears only' listening test or: 'blind' listening test, I will try 'hidden component' listening test. and see how that works.

Wow, don't you really understand what I meant by an "ears only" listening test?

The tree would have to know if there were any living animals within hearing range, before it could decide whether to make a sound or not.

Nothing in the future of scientific discovery, will eliminate the need that all listening tests be ears only (aka blind) listening tests.

In the world of audio, the word 'subjective' has two meaning: a] in the pro audio world, it's an ears only description, rating or preference. b] in the audiophile world, it's whatever the audiophile says, becomes true.

Lets get creative! So if the foils have drain wires: Both spirals at both ends one foil at one end the other foil at the other end But at the end of the day, in the residential real world, it won't make any difference which way you connect them in an XLR balanced interconnect. (balanced XLR...

Because a power cord can act as an interference antenna (either transmitting or receiving) it's possible that power cords can make a difference. But it's very rare and takes almost Perfect Storm conditions to happen. Also it's not the power cord that causes the problem, the cord is just the...