Static electricity: Unique to Vinyl Systems?

your analog system might be telling you that the rooom is to dry..try a humidifier and place some nice greenery in the room such as house plants. Wool rugs will also cause a problem..

Thanks for all the help, there are many useful suggestions here.
I'm still at work and won't have time to try any of these for a while.
However, I'm wondering why I only hear the problem with my analog source, and not with any of the digital sources. As I said earlier, I heard it just as clearly with a different TT and Phono amp, so (unless it's the power cord) I'm wondering if analog is more susceptible to RFI, or static electricity, or whatever the heck is going on.

analogue domain has the highest gain and therefore more susceptible to RFI or static electricity. Also forgot to mention to check tubes if you have them.
how often is your pops? i get them once in blue moon. most of the time i keep my preamp on mute and only engage phonostage when i play records which may be another tip for avoiding those lousy pops.

Yes, as Marakanetz indicated since the voltage levels provided by phono cartridges are vastly lower than those provided by digital sources, and are therefore amplified by vastly greater amounts, vinyl sources are much more susceptible to the effects of RFI, EMI, static, etc.

There have been more than a few threads here in the past in which people were even faced with the problem of hearing radio stations through their system when listening to phono sources.

Regards,
-- Al

Is there carpet under your system? Is the heat in your dwelling extremely dry? Is your system powered by multiple AC circuits?