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realistically, the 475 is just a better scope in every way, and significantly newer and better desgined. and you have to love the 200+MHz bandwidth, and the ability to stop it down for lower frequency work. however, check the serial number, if low (below 20K), it may be a bit of a toss up. but power it up, see if it works, and check that the controls are not intermittent or noisy. a bit of de-oxit will improve the pushbutton switches. check the power supply caps, they are usually in need of replacements, and newer ordinary 105C radials work just fine there, as long as you remember to jumper the old style FP electrolytic ground pads together. the 454 will be much harder to get and keep running. the 475 custom ICs are generally available, the TD's not so much (in the trigger).

all the best,
walter
sphere research corp.