Love / Hate relationship with vinyl?

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!

When I move (or even touch) the cables going to my headamp, the level of hum changes.

Bingo! or maybe bingo ;-) I'd try different ic's to/from the headamp and also check to see if the RCAs on the headamp are secure and properly grounded.

I had the same problem with hum when I added my sut. I tried 4 interconnects and only one, Autitorium 23, stopped the hum. Like you, I could move the sut around,and by touching the transformer or moving it around the hum would change.

It may or not be your problem, but like Swampwalker, your last description reminded me of how I fixed my hum problem.

Swampwalker & Acman3......
Yes, I could try some other interconnects, but this morning, after more aggravation, I decided to take the Hagerman totally out of the the system. I reconfigured my Acoustech phono preamp for MC input (61.5db of gain, 220 pF capacitance, & I like the sound at 47k Ohms resistance). Boom, dead quiet! The headamp was an experiment, and there were several things that I thought it did improve on (bass tightness & impact, stage was slightly improved, and perhaps a bit more extension at the top). However, nothing earth shattering, and certainly not worth the extra noise. Listening now, going straight in to the phono preamp, sans headamp, it sounds incredibly good, and QUIET! Thanks for all your suggestions! I think I'm going to stick with this.