This first shot is the onset of clipping as measured across Pin 1 and Pin2 of the output XLR on the Main Channel.  It is at 10.27V or 22.4dBu

This shot is with the Output Metter showing Red at +9dB (barely in the red). Actual output is 12.6dBu.
LEvel On MEter           RMS MEasured/dBu
0             1.3/4.5
6      2.6 / 10.5
9      3.5 / 13.0
osaught of clipping      9.56/21.8

This shot shows the ouput at 0db on the meeter on Channel 3.  The Head Phone Amp (HPA) (CH 4) is cranked all the way.  Ch4 is read with a pair of Sony 7506 headphones connected and taken at the output jack.

This shot shows the ouput at 0db on the meeter on Channel 3.  The Head Phone Amp (HPA) (CH 4) is cranked all the way.  Ch4 is read with a pair of Sony 7506 headphones connected and taken at the output jack.  It is the same as the previous shot, I just remembered to turn on RMS on the Scope.

This is the threashold of clipping on the HPA with the HPA cranked.  As you can see it happens with the main output hot but not extreamly hot.

Other Notes with no scope shots.  No scope shots were taken because the floating shope can't take pictures.
At 7.13VRMS  Output  HPA is dropping 5.08VPP - 1.75 RMS across series HPA resistor - start of clipping.

Measured across series power HPA resistor at start of clipping 1.48VPP/1.69RMS 1.56pp/1.75RMS
MEasured across negitive supply power resistor at start of clipping 1.4pp / 1,69rms

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