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From a quick Google:
Two record players could be connected, initially both of the type with ceramic pickups, though an optional preamplifier could be fitted inside the Beomaster so that a B&O magnetic pickup could be connected directly.
The matching turntable was also available with an optional inbuilt phono stage, so if I wanted another one I'd need that for the other channel on the amp.
My 70s amp has a inbuilt phono stage which is just connected to one phono input but not to the second one.