PH16X Hum/Buzz

It sounds the same as it does when connected to the ground lug of the phono preamp.

There should be NOTHING connected to phono pre-amp ground lug. It should not even be there.

Please describe exactly what you have done.

thermionicvinyl wrote:

I used "Adobe audition" to record and analyze the noise. It's an Asus Xonar sound card connected to a laptop, with which I then record the output via an RCA to 3.5mm jack cable. The recording is then analyzed after the fact. I'm pretty sure if you want RTA you'd have to use REW.

Thanks. I'm going to add an analog mic input on my macbook pro so I can do the same. Apparently the headphone jack on these is actually a mic jack as well I just found out. Just need a special 4 conductor 3.5mm jack to access the mic. Isn't Apple clever

If I can't get this option to work I will look into a mic adapter for the USB port (a.k.a. external sound card).

Tried something unusual today. I got my hands on a variable auto transformer to see if the high line voltage in my could be causing any kind of issue. (126-128VAC at times.) So I stepped it down first to 120, and then to 115. I honestly cannot notice a difference but it was worth a short and at least I can say that it gave it a shot.

I got an email from a customer the other day who had some hum with his phono preamp, finally solved the problem by moving his AC power cord away from the turntable cables.
Makes perfect sense!! If they must be anywhere near each other, make sure they cross at right angles. Most power cords are NOT shielded !! (the expensive ones are!)