The wire from the board to the 4 ohm pin is for negative feed back. Don't disconnect it. Yes it can be on one of the other pins, but go by your layout.

You need to build a current limiter first before you blow your stuff up.
This is too fancy;

http://www.tdpri.com/forum/shock-brothers-diy-amps/527023-light-bulb-current-limiter-build.html

I would just butcher an extension cord and put a porcelain socket with a bulb in it in series on the black wire.

**I think you may need to reverse the leads to the output transformer from the power tubes.**

Make sure your output transformer is wired to the speaker jacks, not the send/return jacks.

good luck.