Here is another way to look at it. The supply is 400 volts and you are seeing fluctuations of 0.3 volts. Not a bad ratio. I asked this same question in another thread:
http://www.diyaudio.com/forums/tubes-valves/133484-choke-input-filter-lf-noise.html
My scope screenshots appear to be gone but they looked similar to yours.
http://www.diyaudio.com/forums/tubes-valves/133484-choke-input-filter-lf-noise.html
My scope screenshots appear to be gone but they looked similar to yours.
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