Thinging of building Power Supply. Lightweight advice requested.

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It is a Tektronix 420a ps failed.  Threw it away: transformer costs more than a news Silgent 2000X   it WAS a high tech switching powersupply with like 4 voltages out (6 or 8 if +- included).

I realize this project might "be back shelf" (not the easiest project for a hobbiest to finish in near term).

I have a used Tek 420a with working PS (dead acquisition board) to work with.

Can I just disconnect and measure the PS with a 50Mhz scope and mimic the results?  With a few drawdown tests?

Can I just buy four chinese switching modules (one for each V needed) ($12 ea, say) then "make my build all about cleaning up the signal" so it "looks as good as the other" on the 50Mhz scope?  (all four would fit in the 420a easily I think)

Not asking for total instructions.  just broad warnings to save me allot of time, if such advice is possible.  If my thinking is way out of the ball field.

I'm a little familiar with power supply jargon - but totally unfamiliar with "what is sufficient to prevent frying IC". (signal smoothness, maximum drawdown allowed).  I've tried to find lessons on the internet about "what signal clean-ness is required" and "what drawdown is acceptable" for IC chips.  I can't find any after long google searches.  Obviously it would be too big a job to chart every chip's requirements with no schematics ever released.  I need something "more in general".

(tek 420a  mess of a board that "supported all voltages on one 5 layer board not separately but intertwined" (making repair quite awful.  i guess that's high tech!)

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(I could put the working PS in the 420a and sell it.  Look for an easier project.  I'm unsure of how hard a project this is.)