Usually common aluminum or solid tantalum electrolytic caps, depending on the application and ratings needed. As I said, I don't know the application here, but I'm sure others here with 465s will respond soon with advice. I can say that it's unlikely that the original cap even had to be wet Ta - they are special, but were more commonly used back then, usually to save space because of their high C-V product. They are essential though, in certain low-leakage, higher voltage, higher temperature applications, which are unlikely to be encountered in a scope.
Ed
