Serendipity v. 4 DC polarity

[jjm]

Apologies if this has been addresses previously, but I can't seem to locate it on the forum.

I'm just getting around to building a Serendipity v. 4 from a single-sided etched board.  If I'm reading the wiring diagram correctly, it looks like the DC power jack is wired for tip-positive.  Is this correct?  This also appears to be the opposite of the v. 5 diagram.

As an aside, I fear I may have fried a few components trying to figure this out    I'm relatively new to building, so I guess that's part of the process.

Thanks!

Justin