| no!
you can indeed do this, but here's how:
hook the two reds to each other but to nothing else (that gets the 9V+ to the preamp), hook all the blacks except the battery negative to ground, then hook the battery negative to the ring terminal.
i've done a bunch of MMs this way, and it works fine except that sometime you get a weird power-up noise for an instant right after you plug the bass in. (this of course is a non-issue because you would never plug in while the amp was live, right?)
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Walter Wright
Guitar Repair Gnome
Alpha Music, VA Beach
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