[Mondial]

Ron, have you tried connecting a scope to the output when the speakers are connected? It seems like the amp may be oscillating at an ultrasonic freq, which is screwing up the apparent voltage readings. Also you might try measuring voltages with an analog VOM, which is not so sensitive to possible HF AC signals.

As Morzh mentioned, with speakers connected the emitter to base readings on Q15 and Q17 do not make sense at all. This is what leads me to the possibility that you have large high freq signals present which may affect the readings of a DVM.