Love / Hate relationship with vinyl?

Replying to Al.....
I do apologize to you, and to all who read my posts, as I haven't updated my system info here on A'gon for years. What is shown is out of date, and my current system is totally different now.
#1). So....in reply to your statement that I'm using "a multitude of different power conditioning products", well I'm not. All my gear is plugged in to one Running Springs Audio Jacob PC. That's about as simple as I can make it.
#2). I haven't played with a cheater plug yet, but I think that's a great idea to see if I can identify, and eliminate the hum.
#3). My cables are close to everything. When I move (or even touch) the cables going to my headamp, the level of hum changes. I really can't move the headamp too much, as the interconnects coming from my tonearm junction box to the headamp are 1 meter, and the interconnects coming from my headamp to my phono preamp are only one meter as well. All I can do for now is find the position where the headamp is the least susceptible to hum. I've been fairly successful, as, at all but insanely high volume levels, the hum can't be heard. It's only when the volume is way up, and the cartridge is not playing a record, do I hear the hum.
#4). I'm running the output of the headamp into the MM section of the the Acoustech phono, using 220pf. I do plan to reassess going directly into the phono stage without using the headamp.
Thanks for all the info!

Elinor...yes, I have the ground wire from the tt, connected to the phono preamp. I tried running it to the headamp, but that made the hum much worse.

Austinbob, my phono preamp is an Acoustech PH-1P is solid state. My preamp is an Audible Illusions L3. It is tubed, but only two. I replaced the tubes today, and that eliminated the hiss! Now I'm just dealing with a low level hum, at high volumes.

Atmosphere....Thanks for you info on the Jensen SUT. I will research it.
Also, I did replace the two tubes in my Audible Illusions L3 preamp today. No more hiss. Your right, it's not how old they are, its how many hours there are on them. However, some tubes do begin to fail at different times. Who knows? I'm glad I replaces them! :-)

I really appreciate everyone's comments / suggestions. As I have said in some posts above, I replaced the tubes in my Audible Illusions L3, and that did solve my hiss issue.
Now, I'm addressing a low level hum, that I feel is directly attributable to the introduction of the Hagerman headamp in to my system. When I move the position of the headamp, the level of hum changes.
I don't hear the hum while listening to a record at normal listening levels. However, every now and then, I listen at high levels, and, when I do, I can hear a slight hum.
Perhaps I'm being a bit too picky, but I think my phono should be dead quite, even when using a LOMC!