If I use a power line filter, it is generally one of teh small 3A or 6A units, these are commonly available, and I have a selection of both current capacities. They are small enough to use as an AC power input connector, with the standard three wire power cords.
If all else fails, use one of the 1,000 VA toriodal isolation transformers, I have used some which have two 120VAC primaries and two 120VAC secondaries (the unloaded primary and secondary voltages will measure about 5% differently, this is normal.
This works to remove any DC voltage components from the AC power line, and if you have the entire audio system isolated through it then , it eliminates those sneaky AC powerline ground loop situations. I've found these 1KVA toroidal trannies on e-bay and various electronic surplus sites for relatively low prices.
Yeah, CFLa and light dimmer sweitches are the worst culprits, and computer switch mode power supplies are a close runner-up for nasty noise generation problems. At least the computer stuff SHOULD have its own powerline filtering, but then this isn't always the case... Especially with teh cheap PSUs from the computer shows, I'veseen these which had absolutely no AC power line filterijg, the pads were on the circuit boards, but the filter components were not installed. These cheap junkers will really SCREAM with RF interference
/ed B