warning: di ako electrician, nagmamarunong lang
imo, if your adapter has a lower mA rating than your pedal's current draw, the adapter will eventually melt down. the max mA rating means your TS-7 spikes every now and then to 800mA - yun yung sisira sa adapter mo in the long run, kasi di niya kayang ibigay yung ganun kalakas.
just to be safe, get an ac adapter that meets or exceeds the mA rating of the TS-7's recommended adapter, or better yet, magpagawa ka na lang ng psu.
2 cents, please correct me if i'm wrong, sirs.
edit: 800mA pala yung MAX
nung recommended adapter, not the TS-7. that should be ok then, for now. but try to get a regulated psu para kampante ka, most generic adapters are unregulated...