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And a switch somewhere in that circuit?

Probably Lee if the receiving end has a true differential receiver in it, such as an INA134

So Lee you have to ask yourself when I turn off a DC powered inductor, especially one of this size, what happens. You get a very high voltage flyback when the current is interrupted suddenly. E=L*di/dt When you switch off the PS connection to the chuck you need to provide somewhere for that...

Balanced in but, in reality, single ended out...

Jim do you have the schem for the Aragon you have? Does it have balanced outs?

That would defeat the balanced nature of XLR connections if cold was grounded, it would turn it effectively into a single ended connection.

The Accuphase flips the polarity of both channels, not individually, so they are both either standard or flipped polarity. Just speculating... If your customer desires to bridge his balanced input stereo amplifier for higher power mono output purposes, it would generally require a normal phased...

Gin and Tonic season has arrived here in MA...

Foreigner must put on a great show...

Welcome!!

You learned the value of a pair Don... (here comes Navo)

Amplifiers have a bad habit of amplifying anything that is input to them...

Parts matter Kyle... :-)

Tony Soprano...

You have a full comp setup so I am assuming that your quick check procedure is that of having no devices installed on the backplane boards and testing for bias.Q6 and Q9 typically do not get very warm under any circumstance.

It is rare but sometimes coincidences do happen...glad you are vectored onto finding where the problem is...

You should think of the 2 things as potentially unrelated Kyle. You are assuming the backwards cap had something to do with the bias problem when it could just be a coincidence

U1 has near nothing to do with bias Kyle...

R38 is directly involved...

What are you trying to debug? What is the problem you are chasing? If you are chasing a problem, the lack of R38 could be instrumental.