Hello All, I need some advice. A while back (last August), I decided that I wanted to dip my toes into the world of vacuum tubes and bought myself a Hagerman Labs Cornet 3 phono preamp. I've been using it since and I've always noticed some hum when I've been playing records. My setup is as follows: Music Hall Ikura Turntable ---> Cornet 3 Preamp ---> Marantz 2215B Receiver ---> Speakers My equipment is on a vertical AV stand, with the turntable on the top rung, an SACD player and the phono preamp of the second rung, the receiver on the third rung and some cassette storage cases on the fourth (and bottom-most) rung. NOTE: The turntable's ground connection is wired to the preamp's ground terminal. The turntable and preamp are both DC powered (via wall warts). Recently, I've noticed that the hum was really only a problem with the right channel (there is some hum on the left channel, but it is barely noticeable). I did some troubleshooting, and discovered that the hum followed the right channel output of the preamp, regardless of what cables I tried. So, I decided to take apart the preamp, and I noticed that there are two large coils near the power input. Adjacent to the coils are two 470nF capacitors. The circuit board is mostly symmetrical. On the left side (which corresponds to the left channel), there is a copper foil shield between the coil the two capacitors. The right channel did not have a similar copper foil shield. I figured that this must be the problem since I know that coils are normally noisy. So, I went to a "nearby" electronics store (You-Do-It Electronics in Needham, MA) and bought some adhesive copper foil. When I got home, I cut the foil and soldered a small lead to connect the foil shield to ground. I was convinced that this was going to fix my problem. I reconnected the turntable to the preamp and the preamp to the receiver and powered the system up. Unfortunately, this did not fix the problem or even reduce the noise on the right channel. So, now I am in a state where I don't know what to do next (and as the thread title mentions, I'm very frustrated). Should I wire the turntable ground to both the preamp and the receiver? Should I try wiring the turntable ground to the AC service ground? I noticed that the RG and LG terminals of the phono cartridge are not connected to the turntable's ground terminal. Should they be? Does anyone have any advice? Thanks in advance.