C84 Voltages correct but no audio

[Ken Schumacher]

I finally finished my first kit, following the instructions very very carefully. Test procedure voltages measure perfectly +18, -18, 0, and 0 after adjusting the varistors. But I plug in an SM58 for a quick test, route the output of my newly constructed pre to a line input of my Mackie 1604vlz and get absolutely nothing. I tested the phantom power and get 47 volts when switched on, so that seems to be working OK. Yes, I know phantom isn't needed for an SM58 but I wanted to check what the pre puts out.

Tonight I plan to double check the line input cable, and also test the mic pre output by plugging directly into a DAT deck with adapter cables, but I doubt the cable is the problem. If anyone has advice on what to check next, I'm all ears.

Ken Schumacher - Live Vibes Recording - Grass Valley, California

[Ken Schumacher]

This forum is great! Just read a posting about the L1 and L2 load isolators and realize I need to solder zero ohm resistors there. I misread the instructions and thought those components were optional. Hopefully I'll be listening to my first C84 tonight!

[Ken Schumacher]

Soldered the two zero ohm resistors (they actually measured .4 ohm!) and it works! First listen on headphones with an SM58 and a Crown CM700 and it sounded CLEAN! Even with the gain all the way up.

On to C84 #2.