4. The White and Black wires connected to the circuit breaker seem to be 10 guage.
Is the breaker a GFCI (Ground Fault Circuit Interrupter) or an AFCI (Arc Fault Circuit Interrupter)? These type of breakers have a test trip push button on them.
When I switched the Cary on the voltage did not change. Nor did it change during the 20 seconds it takes for the 15amp Cary breaker to trip.Well that is good for the integrity of the branch circuit wiring. That tells me with the load connected the branch circuit maintained the supply voltage with little or no VD, (voltage drop) through the high inrush current cycle.
That also tells me the branch circuit is capable of delivering the inrush current draw of the primary winding of the power transformer.
However when the breaker did trip for a split second the votage meter read 112 volts.I have a feeling the VD drop happened before the trip.....
Question is what is it and why?
At this point it would be good to hear from Almarg or Ralpf of Atma-Sphere Music Systems.
As for your friends theory he could be onto something.
By chance does your friend have a clamp on amprobe so you could measure the inrush current draw of the amp on startup?
As for the circuit breaker used on the Cary.... Is the switch actually a breaker? The handle trips position and has to be reset? If it is indeed a breaker the more times it is tripped the weaker it becomes.
Just can't beat a fuse for overcurrent protection for audio equipment.....
Jim