No O'scope Azimuth Adjustment Procedure

If you don't have an oscilloscope, you can still adjust azimuth, and be 
as accurate as with the o'scope.  Remember that all consoles are 
Voltage amplifiers, and that all of the VU meters on a professional 
recording console (as well as most Semi-pro boards) read the output 
voltage (and NOT THE POWER).  Two equal and in-phase voltages 
will add by 6db when selected to the same output buss.   Thus you first 
patch the tape recorder to 2 different input channels of your board, 
making sure that the board's eq is out, and that there is no Echo Send 
or Aux Sends on. Then select just one channel (Track #1)and send it to
any one buss. Set that one channel's fader level so that your buss output
VU meter reads -6 VU.  Then turn off that channel. Next turn on your other
channel,(it would be Track 16 for a 16 track, track 24 for a 24 track and 
so on...) send it to the SAME buss as the other channel, and again set that
track's channel fader level so the buss output meter again reads -6 VU. 

 Then turn BOTH channels on.  Since two in-phase signals should add 
together by 6 db, you now should be reading 0VU on the meter.  If the meter
is near 0 VU and is stable (not moving around much), you're ok. 
Check another frequency If the meter reads less than 0 VU, adjust azimuth 
until the meter reads as close to 0VU as possible, with as little meter 
movement as possible.  Make sure re-set your -6 vu levels on each channel 
after making any azimuth adjustments !!! You MUST check azimuth with more 
than just one tone.... use 10khz and 15khz if you can.  Once you have 
correctly set azimuth, all tones should read close to 0 VU and be stable.

This then will allow you to set azimuth quickly and accurately without 
having to use an oscilloscope.