TF2R Puzzle Hints

# represents a number
@ represents a letter

1) @ (cmon)

2) @ https://feen.us/bbc6.png   *This is an emission spectrum. 'nuff said.

3) @ https://feen.us/pysq.png

4) # https://feen.us/u171.png   *Ye olde times.

5) @ Look closer. I mean real close.

6) @@ https://feen.us/spcr.jpg

Thanks and good luck.