Static electricity: Unique to Vinyl Systems?

1) I would not trust any aftermaket powercords, but that's just me I guess. My background and current work as live sound tech is what really pulls me off any fancy stuff like that especially when spoken about high gain devices. I would hate to attack anyone who does like aftermarket PCs here because there had been gazillion posts, but regardless, try to use stock power instead and see if it goes away.

2) I'd also try to avoid any MC step ups as there's theoretically none's better than direct to SUT-free phonostage. If you can afford SUT, either you can afford better and higher out MC or MM cartridge and you get your sound set up substantially better and who knows maybe your SUT a-bit 'unhappy' where it is where could be numerous reasons and impedance mismatch isn't the first or last.

3) Power ground isolation. I've seen many home wireing where newtral is instead of ground or ground isn't connected at all

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