TUBE-TYPE MIC MIXER, PART 2

     A reader complimented the schematic I posted yesterday.  Of course, that's the "clean copy."  Here's the one I drew as I traced it:

     You will note several layout errors that are corrected in the later version -- don't know why I omitted the headphone jack wiring in that one, though.  Schematic drawings can nearly always be improved after the first draft gets everything on paper (or on the screen, if you work that way).  The rules are simple, applying them sometimes isn't.

     And here's what I traced:

     The Thordarson "Tru-Fidelity" mic transformers are not original -- the fellow who gave me the mixer salvaged the original UTC transformers.  The Thordarsons are at least as good.  They're also larger.  I'm not happy with the length of unshielded wire in the grid leads, it will want changed.  Looks like I took most of the wire harness lacing out when I traced it, too, so that needs redone as well.  I wonder how those Sprague "Atoms" electrolytics are holding up?  (They're on the terminal board behind the right-hand mic jack.)
    
     Back panel:

     Blank and ready for call letters!  (It's traditional.)

     2" Cannon connectors, with a penny for scale and ancient masking tape stuck on the chassis:

     12-pin Jones plug, holes where a previous user had relocated the output terminals, fuseholder:

     Rannie the cat loves my fancy screwdriver set:

      This made disassembly a little more difficult.

     (Here's another take on a small mic mixer, kind of interesting...if you have the parts.)