Static electricity: Unique to Vinyl Systems?

I agree with Al (airborne rather than system borne.) In addition to the sources of RFI he mentions, I'd like to add two more: (1.) the power cables on ANY digital equipment, and (2.)the RFI created by static discharge such as people walking across rugs/carpets, clothes tumbling in the dryer, etc.

It is important that power cables used with ANY equipment containing digital processing circuits (even if it's just a digital display) are well shielded. And that the associated outlets (wall or power conditioner) have filters that drain 'digital hash' to ground.

I have heard RFI noise from some Class D switching amps to be continuous and at high frequencies. I would associate "Pops and clicks" more typically with static electricity on vinyl records themselves when discharged through the phono ground periodically during playback rather than prior to playing . Low level phonos are without doubt most susceptible to all these noise sources + EMI as well.

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.