A better lamp cord for my stereo equipment?

If that older equipment is Class II double insulated then no service tech is going to play around with changing power cords unless the new cord fits into the existing grommet and the cord has no grounding conductor. So if that lamp cord on your unit is 18/2 then maybe you can find someone to replace it with 16/2. Not sure what benefit that would be.

Correct.  The owner/user of a piece of audio equipment can do about anything he wants to a cord and plug connected piece of equipment.

Anyone claiming otherwise can cite to the relevant law, statute, or regulation.

That doesn't mean that a repair facility can do it, or wants to assume any liability, and besides, as per the above post, it does nothing for SQ.

Reverse the plugs if you have noise.

If it’s been working all these years? Why mess with it! Upgraded old technology with new power cord seems like a waste. 

And you can tear the tag off your mattress, too!

OK    Uncle, uncle!

I just had some great sucess with two cord upgrades for my Bryston amps and I thought my good, 60 year old, McIntosh C-20 preamps and a few of my old signal processors might also benefit from a cord upgrade, if there was a new type of cord out there that might provide an improvement.  
I have to admit I'm a bit befuddled by the fact that the cords have a, "Do not touch" policy attached to them (legal-wise), when I've had capacitors replaced in the power supply in many of my components.
Nevertheless, I was hoping someone would say, "Try this new, oxygen-free copper plus silver, stranded, twisted, cooked, directional cord from So-and-so Supply Co.
Since there doesn't seem that anybody has ever built a better lamp cord, and techs might not be willing to replace the cord anyway; this idea will just have to go on the Not Feasible pile.
Thanks for all of the responses. 

Toolbox