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The 564 is a bench scope. The RM564 is the rack-mount version. | The 564 is a bench scope. The RM564 is the rack-mount version. | ||
The 564 is a tube-based oscilloscope, whereas a later version, the 564B, is fully solid state. | The 564 is a tube-based oscilloscope, whereas a later version, the 564B (1969), is fully solid state. | ||
Mod 121N added auto-erase. | Mod 121N added auto-erase. | ||