Maybe I should have bought the board

[Mark Hammer]

After being on the stack of things to finish up, I finally soldered the last few connections and fired up my build of the MFOS Sub Commander.  Loud hum was all I could get.  Now the troubleshooting begins.  I had etched the board myself, and for a double-sided board, it came out okay.  But it's a BIG board with 18 pots and four toggles.  The challenge facing me is trying to trace the signal, using the schematic as reference...on an unlegended board.  I should have just bought the board, that would have come with all points of interest marked in nice white letters.

[Rob Strand]

After being on the stack of things to finish up, I finally soldered the last few connections and fired up my build of the MFOS Sub Commander.  Loud hum was all I could get.  Now the troubleshooting begins.  I had etched the board myself, and for a double-sided board, it came out okay.  But it's a BIG board with 18 pots and four toggles.  The challenge facing me is trying to trace the signal, using the schematic as reference...on an unlegended board.  I should have just bought the board, that would have come with all points of interest marked in nice white letters.

Are there any leads where you have to solder both the top side track to the bottom side track?  Any opens are going to cause hum.

Back in the 70's the purchased boards for magazines had quite a few places like this.   The manufacturers really only did single sided boards and had no via/plated-through-hole processes.

Oh, yes, and "vias" were single wires soldered both sides.

[Mark Hammer]

Are there any leads where you have to solder both the top side track to the bottom side track?  Any opens are going to cause hum.

I thought I had caught all of those before firing it up, but that's a good idea about where to start.  Thanks for the suggestion.