Replace pwr cord w/IEC socket on vintage gear?

Al, Thanks for your comments. I have been using this method for many years with a variety of components and I have always been able to notice an improvement. The improvement in sound quality varies from one component to the next and it seems to coincide with how much the voltage readings vary. Is this related to the transformers and their windings?

Is this related to the transformers and their windings?

Hi Ron,

Yes, most likely, as stray capacitance in the transformer, and possibly insulation resistance, figure to generally be key factors in the ac leakage I referred to.

It's interesting to hear your observations. I have also routinely done this for many years, but I haven't taken the time to assess the differences it may have made, my philosophy being that it can't hurt and might help.

One point that's worth noting is that the value of the voltage readings will vary considerably depending on the input impedance of the meter that is used (which is commonly unspecified). Since the resistance of the leakage path in the component will typically be very high (on the order of several megohms or more), a meter having a relatively low input impedance (such as many analog meters, particularly on their lower voltage scales) will load down the voltage and indicate a much lower reading than a quality digital meter that presumably and hopefully has a high input impedance. The higher the readings are that the meter makes possible, the more pronounced the difference between the two voltages will be.

Best regards,
-- Al

I must have gotten lucky when I plugged this Heathkit in and got the optimum orientation. It has a 2-prong plug and its noise floor is subterranean. I hear low level details on familiar recordings (all in correct musical perspective) that I hadn't heard before, not even on headphones.

I had a certified technician who I've known and trusted for a long time put IEC's into my Conrad Johnson Premier 12 mono blocs. Best move I've ever made. While they sounded perfectly great with their captive stock cables (and a noticeable step-up they were when compared to much of the other "captives" out there), playing with the aftermarket cords has dramatically improved the quality of my system and the ability to customize the sound is truly condiment(s) to the smorgasbord. Priceless. Well worth it. Don't hesitate, just do it.
BTW, if it's the ONLY modification done to an otherwise stock amp, I agree it will probably INCREASE its marketability and value....The one thing that discourages me from otherwise being attracted to vintage gear is knowing I have to get the IEC's done. Generally speaking, why be stuck with stock captive power cables when there is so much more potential within virtually all amps when you partner them up with a cable that enhances/synergizes "Just right" for your own system!!! Enjoy.