Join Date: Apr 2006
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Arf, I'm pretty sure that ALL electronic stereos use a separate "keep alive" wire for the memory functions, since 1980-ish.
The good news is that they use about 5mA for this function, that's 0.005 amps per hour, which is not a whole lot.
If that's still too much for you...I do have a mid-70's vintage radio salted away, AM/ FM stereo/ cassette with five pushbuttons, that you set the five stations with the old fashioned mechanical way. When it turns off--it really is OFF. No, I have no further specs on it, don't even remember the brand offhand, it is in a box on a shelf, got sidelined by a ghettoblaster a long time ago.