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I really miss my old 465B. That appeared to have had all the nasty design flaws knocked out of it by the time they got to the B revision.
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It is interesting that Tek kept the same model number for some scopes like the 464 and 466, there are two versions of each that are quite different animals. The latter versions of the 464 for example , serial B200000 and up had got rid of the unreliable lamps and gone to LED's. The vertical boards were much better made (re-designed) and a lot of other improvements internally. I would only every consider the later versions, these can be recognized by the LED's and slightly different panel artwork around the attenuator areas. Ebay sellers don't know and they are just sold as 464's and 466's.