[Maarten]

Or 100% correct replacements. Sometimes they also provided replacements themselves, soetimes with small modifications. The likely reason for this is that Sony didn't really look at what parts were available when starting with a new design, but made an optimal design and only then looked for parts that would work in the design or probably only at that stage makes small compromises in the design. They sometimes used selected versions of existing parts, but in that case they were usually marked as such.