DIY Vacuum Tube Mixer upgraded!

12 volume controls added and output amplifier improved.

I was able to lower the noise floor of the board, which was already reasonably low to begin with.  That just makes every mix through this board sound better.  Unrelated to that I also expanded the headroom of the output amplifier by doubling its operating voltage (250v B+).  She sings!   This lowered the THD a little bit, making the board sound bigger, cleaner, and punchier.  The low-end sounds tight! :)

I'm really loving being able to control volume of individual channels right on the board.  Previously I had to do it either in Pro Tools or with outboard analog gear.  It feels so much more natural and creative doing it right on the board.  There is a sonic difference that I'm picking up with controlling volume on the board vs. in Pro Tools.  Its subtle, but the board seems to have a cleaner/more natural tone to the tracks when adjusting volume.  I think I'm in love :)