Its most probably the 12v connector on the Empeg that gets used on the home power supply. You would have to crack the case open and take a look. Sounds like one best left to the Cambridge people to me.
Some people might want to use the tuner module in the house, so I don't think thats a good idea. Also what about people that don't have a tuner module in the car ! Although anyone without at least two tuner modules to their name should hang their heads in shame

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Rod ,UK Mk2a Sn:1911 Mk2 64gig S/No:341
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Rod, UK